Is he going to cheat or am I paranoid

Me and my husband just had a baby 3 months ago and its been a challenge on our marriage. Its been weeks since we've had sex he's been working late. A kiss goodnight is a chore for him. We don't have a conversation about really anything. There's really no affecting from him anymore not even the daily ass grabbing he use to do when he'd walk by. Is this normal with a new baby or could this lead to him looking for another girl. I know I've gained some weight (10 lbs) and I have the mom pooch and stretch marks now so maybe he's just not attracted to me anymore