Hunger
This is probably the first thing you think of when your baby cries. Learning to recognize the signs of hunger will help you start feeding your baby before the crying stage. Some hunger signs to watch for in newborns include fussing, lip smacking, rooting (a newborn reflex that makes babies turn their head toward your hand when you stroke their cheek), and putting their hands to their mouth.
Stomach problems from colic and gas
Tummy troubles associated with gas or colic can lead to lots of crying. The rather mysterious condition known as colic is usually described as inconsolable crying for at least three hours a day, at least three days a week, at least three weeks in a row.
A dirty diaper
Some babies let you know right away when they need to be changed. Others can tolerate a dirty diaper for quite a while. Either way, this one is easy to check and simple to remedy.
Too cold or too hot
If your baby feels chilly, like when you remove her clothes to change a diaper or clean her bottom with a cold wipe, she may protest by crying.
Newborns like to be bundled up and kept warm – but not too warm. As a rule, they’re comfortable wearing one more layer than you need to be comfortable. Babies are less likely to complain about being too warm than about being too cold, and they won’t cry about it as vigorously.