My child is three and a half month old but he can't sleep.he always keep crying.when I force him to sleep he just sleep for five minutes and then gets up.he keeps on yawning.can you solve my this problem.

My 3 & half month child can't sleep

What do you mean you "force him to sleep?"

What is his normal sleep wake pattern?

There really is not enough information in your question to give you a proper answer.