cranky baby

My son has been extra cranky lately, probably from teething but every time my mother in law comes to see him he gets upset while she's holding him. Then I feel bad because as soon as I take him back he's happy. I left him with her while my husband and I went out and he was screaming and crying when we got back 😔 I know she loves him so much and I'm sure she understands babies are just like that but I hope he gets over it.