Dissociation?

Hello, I have noticed that when my baby is being looked after by someone else and not with me, I hardly think about them, like I'm not beside myself or texting the person to see if there okay. I also have noticed if someone is holding him or entertaining him that's not my partner I feel just numb/like as if a switch has gone off. Am I overthinking this? Or is this something? Maybe I'm just absolutely exhausted and shut off when I don't have to be fully responsible. Baby is 4months, 1st time mum, autistic and adhd (what a combo!) Any advice welcome x