Would you tell his ex that he isn't looking after his child properly?

[empress0]

I'm new here and don't have children myself but I need some opinions, as I'm not sure if I should get involved or not.

I'm in a very new relationship with someone and he's got an almost 1yo with his ex, they split up before their son was born though, and we've only been in a relationship for about 3 months. Yesterday, I went to his and he had his son, i didn't know this as he didn't tell me previously.

His son wouldn't drink his bottle so he put him in his cot, he then started crying, but boyfriend said he'd stop soon, he didn't so I told him to go to him, which he didn't seem happy about, he then gave him to me and told me to ‘sort him out then’ and just went out.

I did manage to calm him down and he was asleep when boyfriend got back and apologised.

Should I tell his ex?

The red flag is walking out and leaving his baby with you. You sound sensible, but he’s only known you for three months. I’d want to know as the mother. I’d be very concerned about that.

The leaving the baby to cry after not taking his bottle bit is up to him. It’s not my bag at all, but if the baby was safe and in the cot it’s his decision now he parents I suppose.