There is increasing evidence that suggests that early skin-to-skin contact between mother and baby stimulates breastfeeding behavior in the baby. Newborns who are immediately placed on their mothers skin have a natural instinct to latch on to the breast and start nursing, typically within one hour of birth. Immediate skin-to-skin contact may provide a form of imprinting that makes subsequent feeding significantly easier. Interrupting the process, such as removing the baby to weigh him/her, may complicate subsequent feeding.Frequent suckling in the first days of life is correlated with higher milk production. Infants should be fed when they show signs of hunger. It is common for breastfed babies to feed during the night for the first six months. Usually feedings last 10–15 minutes in the early days.If the infant is unable to breastfeed, it is recommended that pumping or hand expression of milk begin within two hours of delivery, and be done at least eight times every 24 hours. Management
Attempts to increase milk supply should begin promptly as the longer low supply continues, the more difficult it is to reverse. The primary method for increasing milk supply is to increase the frequency and the thoroughness of milk drainage from the breasts, and to increase breast stimulation.For mothers of healthy term infants who are able to nurse, very strong evidence supports improving breastfeeding practices as a primary treatment. Increasing skin-to-skin contact between mother and baby, and allowing unrestricted breastfeeding, aid in stimulating the milk ejection reflex and promote frequent feeds.
Secondary causes are far more common than primary ones. One study found that 15% of healthy first-time mothers had low milk supply 2–3 weeks after birth, with secondary causes accounting for at least two-thirds of those cases.Breastfeeding management issues that can interfere with regular milk drainage from the breast include poor latch, unnecessary use of supplemental formula, timed or scheduled feedings (as opposed to on-demand feedings), and overuse of pacifiers. Medical conditions in the infant that result in weak or unco-ordinated sucking can cause low milk supply by inhibiting the transfer of milk to the baby. These conditions include tongue-tie, congenital heart defects,  prematurity, and Down syndrome.Primary causes of low milk supply include:

insufficient glandular tissue, also known as primary lactation failure. Breasts with insufficient glandular tissue often have a tubular shape, with a large space between the breasts, and often do not grow during pregnancy. retained placenta
Sheehans syndrome
prior breast surgery (especially breast reduction)
prior nipple piercing
polycystic ovary syndrome (PCOS)
hypothyroidism
hypoprolactinemia
theca lutein cysts
hypertension
pregnancySmoking more than 15 cigarettes per day is associated with reduced milk production. Many medications are known to significantly suppress milk production, including pseudoephedrine, diuretics, and contraceptives that contain estrogen. It is suspected that some herbs, particularly sage and peppermint, suppress milk production. Mechanism
The physiological mechanisms that regulate breast milk supply are poorly understood. High levels of prolactin are necessary for lactation, however there is no direct correlation between baseline levels of prolactin and quantity of milk production.