Baby seems different since I’ve gone back to work...

Is it normal for a baby’s personality to change/for him to seem different (more disconnected, a little sluggish and sad) when mom goes back to work after maternity leave? My baby (3 months) just doesn’t seem “like himself” since I started going back to work. He definitely now has a different routine and maybe isn’t stimulated as much as he was when I was with him 24/7 over the past 3 months. It’s starting to make me sad and concerned to feel like he is different without me around. The mom guilt I feel is sooooo intense. Anyone experience a change in their infant child when their maternity leave ended? 😔