Baby won’t nap

April

My baby is four months and won’t nap I can’t put him In his crib my husband works nights and he won’t be able to sleep with baby In there. He want sleep unless I am holding him and still won’t sleep more than ten minutes. I don’t know what to do I am so tired exhausted it’s me all day I want to cry. He sleeps so good at night no problems I wouldn’t care I during the day he wasn’t crying because of lack of sleep if he was happy I wouldn’t be bothered by it at all help?????? Tired mommy