Baby abroad with dad

you’re not being unreasonable at all. especially since he hasn’t had her overnight yet. based off what you’ve said, i’m in a similar position where my 10 month old sees her dad every other saturday, not overnight, due to his drug use & i’ve basically done everything myself the past 10 months. and i would never let him take her abroad this young.
idk what your baby is like when away from you, but since your her primary parent i’m not sure she would like being away from you for that long either.
if it was me i definitely wouldn’t let him take her abroad without you, not until your babies older and has spent more time with him.
sorry if this isn’t helpful, but you’re completely valid with how you’re feeling

Nooo the reaction you have is completely normal because that would be a big NO for me, I don’t care if he’s the best dad in the world I can’t bear the thought of separating from my child for a week or ABROAD??

I think, there are more aspects to consider, not only that she won't be used to be without you since you are her primary caregiver... Also, would he be responsible to meet all her needs? Is he aware of everything that's involved in taking care of a baby that age 24/7? I don't think so.
His drugs would be a super red flag for me not to leave my baby alone with him. Aaaand most of all:
Taking a baby abroad to his family without you, both of you not in a stable and trustworthy relationship, a family that you maybe don't know, have no contact or address, IDs, etc of.... Maybe it's just because of my job and some cases that I have to deal with sometimes... But cross-border child abduction is coming into my head and mind...
Most of all if the other parent is not trustworthy and there are issues in the relationship...
I am not saying that this would happen for sure but you never know. And sometimes it's a spontaneous action... But the possibility is there

Before he takes her away he needs to have her overnight

Please seek civil advice - citizens advice bureau or a solicitor if you can pay

You must do whats best for baby and at 12 months they need consistency and their primary care giver

Not unreasonable at all. If you think you can get on board with the idea, then he should work up to having the baby for that long. So do one night, then two nights etc etc. I’m not sure when it actually came to it he would really want her to himself for a week. Big shock to his system responsible for a child that long when you haven’t done it before.
Is he planning when he is there to palm the baby off onto his mother/relatives etc? Is he going to be going out with old friends/relatives? Do you know these people? Do you trust them?
If he is adament he wants people to meet the baby then would a compromise be that you go with him?

You're not being unreasonable.

It's insane that he's asking for reasons why you're not okay with it 😂 The reason is she's too young to be apart from her primary care giver for a prolonged period and he's not even done an overnight with her, let alone multiple in a foreign country.

If it helps, if he tried taking her abroad without consent from from you, he will likely be stopped by border control and asked to prove he has permission from you to travel with her. Otherwise it's child kidnapping x