If you're flying in daytime hours, you can do Boots click and collect at the airport for nappies/ formula/ shampoo etc saves weight in suitcase and doesn't count towards your handluggage allowance :)
Different airlines offer different weight allowances but it defo should be better you need more weight these tiny humans come with so much!!!
Emerites give you 10kg, hand luggage and stroller for baby
If you book with british airways and you check in an adult suitcase you get 23kg checked for baby for free! But tbh every airline needs to offer more than that Tui offer 10kg for baby