Lactation play

Lactation Play

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Lactation play

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Lactation Play -

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In hours postpartum, copious amounts of milk are produced under the lactogenic effect of prolactin. As mentioned above, other hormones also play their role in the production of milk as they provide the required amino acids, fatty acids, glucose, and calcium.

The basal level of prolactin soon becomes equal to that of a non-pregnant female. If the mother feeds her newborn at regular intervals, every time she nurses him, neuronal signals go to the hypothalamus, increasing the level of prolactin to 20 folds.

Prolactin is therefore required to keep the mammary glands functional. If the mother stops feeding her child, the prolactin surge does not occur and the milk production stops.

However, if she continues feeding, the milk production continues for a few years postpartum, but the quantity may decline over months.

Hypothalamus is known to stimulate the pituitary hormones. However, in case of prolactin, it has an inhibitory role.

If the baby suckles the nipples, neuronal signals are sent to the hypothalamus and the inhibitory effect on secretion of prolactin is lost.

Thus, prolactin is secreted by the pituitary gland leading to milk production. If there is an injury to the hypothalamic-hypophysial system , the inhibitory response is permanently lost causing an increase in prolactin secretion.

There are two factors secreted by the hypothalamus:. This eventually suppresses the production of follicle-stimulating hormone FSH and luteinizing hormone LH by the pituitary gland.

Nursing mothers, therefore, do not ovulate as follicles do not undergo maturation and development.

This occurs in approximately half of the nursing mothers. With continuous feeding, the pituitary gland overcomes the inhibitory effect and starts producing FSH and LH.

Breastfeeding, therefore, acts as a natural contraceptive. License: CC BY 3. When the baby suckles the nipples, initially he is not sucking any milk.

Sensory signals traveling through the somatic nerves reach the spinal cord and finally to the hypothalamus , which secretes another hormone called oxytocin.

Oxytocin travels in the blood to reach the myoepithelial cells surrounding the outer wall of the alveoli, causing them to contract.

This increases the pressure inside the alveoli to 30mmHg and forces milk into the ductal system. Oxytocin and prolactin are secreted simultaneously and, after 30 minutes of suckling, milk starts to flow in the ductal system.

Several other factors also influence the release of oxytocin, such as the sound of a baby crying, fondling the baby by the mother and other psychogenic factors.

Therefore, undisturbed puerperium is essential for successful nursing. The sucking reflex is a primitive instinct present in all newborn mammals.

It is linked to the rooting reflex and allows the baby to suckle anything that comes into contact with the roof of the mouth.

At four months the involuntary response changes into voluntary conscious action. It comprises of two components:.

Breast milk is the primary source of nutrition for the newborn. The milk ejection reflex also called let-down reflex is not always consistent, especially at first.

Once a woman is conditioned to nursing, let-down can be triggered by a variety of stimuli, including the sound of any baby. Even thinking about breastfeeding can stimulate this reflex, causing unwanted leakage, or both breasts may give out milk when an infant is feeding from one breast.

However, this and other problems often settle after two weeks of feeding. Stress or anxiety can cause difficulties with breastfeeding.

The release of the hormone oxytocin leads to the milk ejection or let-down reflex. Oxytocin stimulates the muscles surrounding the breast to squeeze out the milk.

Breastfeeding mothers describe the sensation differently. A poor milk ejection reflex can be due to sore or cracked nipples, separation from the infant, a history of breast surgery , or tissue damage from prior breast trauma.

If a mother has trouble breastfeeding, different methods of assisting the milk ejection reflex may help. These include feeding in a familiar and comfortable location, massage of the breast or back, or warming the breast with a cloth or shower.

Suckling by the baby innervates slowly-adapting [10] and rapidly-adapting [11] mechanoreceptors that are densely packed around the areolar region.

The electrical impulse follows the spinothalamic tract , which begins by innervation of fourth intercostal nerves.

The electrical impulse then ascends the posterolateral tract for one or two vertebral levels and synapses with second-order neurons, called tract cells, in the posterior dorsal horn.

The tract cells then decussate via the anterior white commissure to the anterolateral corner and ascend to the supraoptic nucleus and paraventricular nucleus in the hypothalamus , where they synapse with oxytocinergic third-order neurons.

The somas of these neurons are located in the hypothalamus, but their axon and axon terminals are located in the infundibulum and pars nervosa of the posterior pituitary , respectively.

The oxytocin is produced in the neuron's soma in the supraoptic and paraventricular nuclei, and is then transported down the infundibulum via the hypothalamo-neurohypophyseal tract with the help of the carrier protein, neurophysin I , to the pars nervosa of the posterior pituitary, and then stored in Herring bodies , where they are stored until the synapse between second- and third-order neurons.

Following the electrical impulse, oxytocin is released into the bloodstream. Through the bloodstream, oxytocin makes its way to myoepithelial cells , which lie between the extracellular matrix and luminal epithelial cells that also make up the alveoli in breast tissue.

When oxytocin binds to the myoepithelial cells, the cells contract. The increased intra-aveolar pressure forces milk into the lactiferous sinuses, into the lactiferous ducts a study found that lactiferous sinuses may not exist.

A surge of oxytocin also causes the uterus to contract. During breastfeeding, mothers may feel these contractions as afterpains.

These may range from period-like cramps to strong labour-like contractions and can be more severe with second and subsequent babies.

In humans, induced lactation and relactation have been observed frequently in some cultures, and demonstrated with varying success in adoptive mothers.

It appears plausible that the possibility of lactation in women or females of other species who are not biological mothers does confer an evolutionary advantage, especially in groups with high maternal mortality and tight social bonds.

Lactation can be induced in humans by a combination of physical and psychological stimulation, by drugs, or by a combination of those methods.

Rare accounts of male lactation as distinct from galactorrhea exist in historical medical and anthropological literature, although the phenomenon has not been confirmed by more recent literature.

Domperidone is a drug that can induce lactation. Charles Darwin recognized that mammary glands seemed to have developed specifically from cutaneous glands, and hypothesized that they evolved from glands in brood pouches of fish, where they would provide nourishment for eggs.

As all mammals lactate, lactation must have evolved before the last common ancestor of all mammals, which places it at a minimum in the Middle or Late Triassic when monotremes diverged from therians.

Oftedal has argued that therapsids evolved a proto-lacteal fluid in order to keep eggs moist, an adaption necessitated due to diapsids parchment shelled eggs which are more vulnerable to evaporation and dehydration than the mineralized eggs produced by some sauropsids.

During early evolution of lactation, the secretion of milk was through pilosebaceous glands on mammary patches, analogous to the areola, and hairs on this patch transported the nourishing fluids to the hatchlings as is seen in monotremes.

Another well known example of nourishing young with secretions of glands is the crop milk of columbiform birds.

Like in mammals, this also appears to be directed by prolactin. The discus fish Symphysodon is known for biparentally feeding their offspring by epidermal mucus secretion.

Lactation is also the hallmark of adenotrophic viviparity - a breeding mechanism developed by some insects, most notably tsetse flies.

The single egg of the tsetse develops into a larva inside the uterus where it is fed by a milky substance secreted by a milk gland inside the uterus.

Toxeus magnus , an ant-mimicking jumping spider species of Southeast Asia, also lactates. The early milk, or colostrum , is rich in essential amino acids , the protein building blocks essential for growth; it also contains the proteins that convey immunity to some infections from mother to young, although not in such quantity as among domestic animals.

The human infant gains this type of immunity largely within the uterus by the transfer of these antibody proteins through the placenta; the young baby seldom falls victim to mumps , measles , diphtheria , or scarlet fever.

For a short time after birth, proteins can be absorbed from the intestine without digestion, so that the acquisition of further immunity is facilitated.

The growth of harmful viruses and bacteria in the intestines is probably inhibited by immune factors in human milk.

After childbirth the composition of milk gradually changes; within four or five days the colostrum has become transitional milk, and mature milk is secreted some 14 days after delivery.

There is no typical age at which human infants are weaned, for this varies from country to country and among the social classes of a nation.

In India women in the higher socioeconomic groups tend to use artificial feeding, while the reverse relationship holds in Britain and the United States.

Most commonly, weaning is a gradual process, with a gradual increase in the proportion of solid food supplied to the infant together with breast milk.

With the reduced demand of the baby, lactation slowly declines and stops. Estrogen treatment is often used to suppress lactation, and the high doses used may accomplish this; but there is often a rebound effect at the end of treatment.

Lactation may be slightly depressed when oral contraceptives are being taken in high dosage. Although ovulation is less frequent during lactation, it does occasionally occur.

Breast-feeding should not, therefore, be used as a method of contraception. Menstruation usually resumes within six to eight weeks in women who are not breast-feeding; the length of its absence varies in women who breast-feed.

Article Media. Info Print Print. Table Of Contents. Submit Feedback. Thank you for your feedback. Introduction Composition and properties of milk Weaning and the cessation of lactation.

See Article History. Britannica Quiz. Which of these enzymes was discovered by Bayliss and Starling in the year ?

Lactation Play

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Warren Air Force Base, Wyo. Lactation rooms at bases across the Air Force provide a private and comfortable environment for nursing mothers to express breastmilk, which promotes health for both the mother and baby.

Enabling mothers to fulfill their motherhood responsibilities at work benefits mission readiness, both in the short and long term.

Air Force photo by Capt. Ieva Bytautaite. Air Force photo by Staff Sgt. Sean Sweeney. The Department of the Air Force recently announced new guidance that will improve support to nursing mothers when they return to work after having a baby.

The updated policy, which is effective immediately, increases flexibility with lactation breaks and also mandates access to a refrigerator for the purpose of storing human milk.

Changes like these contribute to readiness, and improve quality of life for our service members and their families.

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Lactation Play

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