I gave birth last week and have just been to register baby today with baby’s dad. We’re not together but are co-parenting as friends - using that term loosely for now. I paid to have the full birth certificate issued at the time of registration. He said straight away that we could the split the certificates so one of us have the abbreviated one and one the full. I said I’d rather keep them together. When we got back to the car, he snapped and said I shouldn’t get to have the final say in everything, he wants something that’s part of her too (it’s a bloody piece of paper?!) and I shouldn’t get to keep them both. I have no idea if I’m being unreasonable by wanting to keep them both together and with me, but I can’t see a reason why he would need one apart from to be petty and ensure he has half of it for the sake of it. Am I being unreasonable?