There is no better food for the baby that the one that his mom can offer naturally. In some moments you can go so far as to feel inconveniences as there can be uterine contractions but do not worry that this is normal since your body is returning to the normality.
It tries to support a diet at abundant liquids level to keep you hydrated and healthy since the feeding of a nursing woman must be major than during the pregnancy period.
If what worries you is to support the form of your bosoms what you have to do is to try to use a good support so much day as at night managing with this to support the steadfastness.
A good hygiene of your hands before nursing also, is an important practice and to support your supported back will avoid you to feel tired.