Reasons can be many. Baby chewing on breast or not feeding for longer is a major cause. If pain is in breasts then you can use a hot water pack. If pain is only in nipples then you can use an ice pack. Breast milk application all over also relieves pain. Avoid feeding while in pain.
Avoid eating spicy or anything that can cause acidity in baby.
It takes two to three days for milk to be sufficient. Still you should continue to feed. The more you feed the more milk will be produced due to hormonal changes.
One session should be 40 minutes. Check why your baby stops. If the breast is too large and presses on baby's nose, if nipples are not big enough for baby to suck or some other reason could be hampering feeding. Correct position is also important. If baby passes urine around 7-8 times a day then his stomach becomes full.
Join postnatal class where you will learn and practice breast and arms toning exercises.
Watch how many times baby passes urine. If it is 7-8 times then it is alright. Keep feeding baby. Take healthy meals every two hours.
After 6 months you can start top feed and gradually reduce the number of times you feed.
Mother can eat everything healthy. Avoid spicy foods.
Reasons could be inactivity of baby due to which there is no appetite. Make baby active.
If milk production is insufficient then you can.
Position of feeding is important. Also burp your baby by keeping your baby against your shoulder and patting the back.
It could be an infection. Visit doctor.
If baby is unable to position itself to grip nipple then it behaves this way. Ensure areola (dark area around nipple) along with nipple is in baby's mouth. Mother must hold breast in c or u shape to support baby while feeding.
Milk inside has formed clot this could be the cause of an infection and fever. Visit doctor.
Babies take feed for 20-40 minutes. For the initial 10-15 minutes the milk is full of proteins and vitamins. After that the rest of the feed is fatty, thick milk. However don't stop feeding after the initial 10-15 minutes. Feed from breast till it is completely empty and then switch to other side. The fatty milk helps baby feel full. If the baby doesn't get the fatty milk it won't feel satiated and will cry. Ensure that you burp the baby else it will vomit out all the feed. WHO recommends that baby feed from mother immediately after birth. The first milk that is produced is called colostrum and it helps prevent jaundice in babies.
Also read: Diet After Delivery: 15 Must Have Superfoods