Please help. Baby doesn’t pay attention to mom. I feel like a failure...

My 12 week old son doesn’t pay much attention to me. If I want him to smile I have to really work for it...and even then I sometimes don’t get him to. My husband just has to walk into the room and my son can’t take his eyes off him and constantly smiles and makes all the cute baby sounds at him. It’s making me feel like a failure as a mother because my child doesn’t seem to be happy with me. I had a c-section and a difficult recovery so my husband had a lot of the night shifts bottle feeding him (I couldn’t breastfeed him). I also had a lot of emotional stress in the beginning (I’m 30 and my parents were going through a separation on top of my dads infidelity) but I did the absolute best I could with being as present for my baby as I could. That was only for the first couple of weeks. Since then it’s been life as usual and I’m doing about 80-90% of caring for him now. My husband has been working from home for the past 5 weeks so I’ve been with the baby non stop pretty much...but the baby does see him all throughout the day so I can’t imagine it has to do with missing him. I’m so happy they seem to have a lovely father son connection...I’m just wondering where his connection to me has seemed to fail. Any advice? Is this normal?

we also have an almost 3 year old daughter who he also gets happy to see. I’m wondering what I’ve done wrong.

I try so hard. I’m with him all day. Why doesn’t he seem attached or connected to his mom?