Am I a bad mom for this??

I just had a baby 4 weeks ago and my son hasn’t adjusted very well, hes18 months and he’s been acting out a LOT ever since having her. He’s constantly trying to throw things at her or hit her and it’s hard for me to spend more one on one with him because she screams if she’s not held and I’m alone with them for 10 hours a day.

I don’t have any friends that can help, I have no family. I’m thinking of putting him in daycare but I don’t want him to feel like I’m pawning him off because of the new baby. However I think it would greatly benefit him, he’s not getting nearly enough interaction and is behind on speech.

Would this seem like a terrible thing to do? My mil thinks I’m horrible for considering it....