Do not worry about the shivering. Babies should be wrapped nicely as they cannot maintain the body temperature easily. Breast milk becomes copious as the baby suckles the breast. In the beginning, there is just
colostrum which is rich in antibodies and it is the ideal food for the baby. Continue putting baby to breast frequently and DONOT give top feeds. Most babies have some physiological jaundice
which clears in 15 days or so.