how old do you have to be to have a baby
Rating Newest Oldest. Best Answer: Biologically your body has to be ready, normally about 12 to 16 years old. Next sex has to be legal, in UK this is 16 years old. Next a baby needs both parents so you need to be in stable ( preferably married) relationship. Minimum age early to mid twenties for girls, a bit later for boys. Next babies cost a lot of money so you need to be financially stable and mature.