I don’t know about America, but it’s the childless that subsidise the parents in the UK. Having kids is a massive draw on the state - the vast majority of people go from being net contributors to net drains on the public purse when they have kids.
Given that parents need to buy diapers, kid clothes, and other stuff needed by babies, if UK still has VAT I do not believe that parents are «net drains».
Really?! Then I should consider moving from Italy to the UK! (I am a father of three, and here there are no exemptions at all for diapers, baby food, bottles, and so on. VAT here is 22%.)