Infants and young children shouldn’t be 50:50, they should be with their primary career.
My children are 5 and 2 and there is no way they would cope with regularly being away from me for half a week - especially the 2 year old.
I’m sure it has been proven over and over again that what is best for the child is a stable home, a secure base and being with their primary career.
My friend went through a break up where the father demanded 50:50 of their 4 year old. My friend said no way and so he took it to the court.
The judge allowed him every Tuesday after school until 7pm, and then every Friday night from 5pm, sleeping over and back by midday on the Saturday.
Funnily enough after a few months he stopped being so bothered and although he would pick their daughter up from school on the Tuesday he would drop her back at 5pm as opposed to the 7pm.
And regarding the overnights....he probably has her one Friday out of the three he should be having her.
He doesn’t have any contact in the week to ask after her either, I.e he doesn’t phone or text my friend to ask after their little girl, or ask to speak to her on the phone etc.
The little girl is completely unbothered about her dad and there is no real attachment there. In fact the girl will only have a sleepover if the sleepover is at the grandma’s house (paternal grandma).
Funnily enough his interest in his daughter and adherence to the Court’s ruling started to wane when he met another woman. He now lives with that woman I think he sees his daughter as just an inconvenience.
OP: men threaten a lot of things and it’s purely to scare the mother. Ignore him and get legal advice, there is no way he will get 50/50 and I’m sure that even if he does (when the child is a lot older) he will soon tire of the responsibility and impact on his life.
Just enjoy your baby, put his empty threats to the back of your head and don’t let him think he’s upsetting you, because that’s the only thing that this is about.