How long should my baby feed in one sitting?

Not very long: Feed when baby is happy and interested to eat. Stop feeding the baby when baby shows signs of fullness : 1. Baby is not interested to open mouth. 2. Baby's head turns when seeing the spoon coming. 3. Baby is getting restless or angry. 4. Baby is spitting out most of the food. 5. Baby has big burped and hiccups.

Depends on age: If your baby is breastfeeding how long he is on the breast depends on his age. In the beginning he's still learning how to nurse effectively and your body is still mastering the let down process. In the first few weeks each feed may take 40 minutes (10-20 minutes on each breast). By the time his 6 months old you'll both be more efficient and he'll spend 5 minutes per side and be back to playing.