My almost three year old will not sleep through the night, what could it be?

Many causes: Sleep problems in young children can be caused by behavioral concerns, medical problems, or anxiety. Best to see your child's doctor to explore the different possibilities. Good luck!

Parenthood: Welcome to the world of parenthood. Each child is different and does not come with an instruction booklet. Good luck. We had two daughters one who was like this and the other totally different. The oldest was like this and has two children one like this and the other like her sister. We have survived this. God has a sense of humor.

Don't reinforce it: Most common reasons: 1). He falls asleep somewhere other than his own bed, 2) you make eye contact, talk to him hold him or let him in your bed when he night wakes 3) he still has a bedtime pacifier or bottle 4) sleep apnea, usually in overweight kids 5) separation anxiety disorder. If ignoring his night crying is not for you, there are graded ways to do so on aap.Org or its healthy child app.