I need to disable infants.

To be honest, no one really wanted infants, at least not the way Maxis gave them to us. What we wanted were babies that are not objects confined to their cribs. Babies that you can take everywhere, including on community lots, the same way we could in Sims 2 and 3. Maxis said "We are listening you and giving you what you want". But instead of what we really wanted, they gave us new lifestage that is something in-between babies and toddlers no one really wanted and left the object babies be. Sorry Maxis, but that's not what we wanted. I personally would've preferred an option to turn off the object babies and play just with infants, but every player is different and want different things in their game, so, we should have both options IMO.

@thedirectorlives I rarely create them and have Neighbourhood Stories turned off in my game. If I want to create a family with small children I create Toddler age children or adopt them at a different age group. So there is a way to avoid them altogether. Turning off Neighbourhood Stories helps as it will stop households from filling up with babies and then turning off Ageing would stop those babies growing to infants. So in your Game Options those may be the settings that you are looking for if you haven't already made those changes.

By doing that, I only have infants in my households when I want to add one at that time and I have total control over it.

Just age them up immediately? Pretty sure the age up option is in the baby care menu within a sim hour of you aging them up from newborn. Or maybe as soon as you have the parent interact with them once. It’s available pretty quickly, anyway.

Actually think I was thinking of newborns and infants you can just use a cake. Either way, you can just age them up early. I believe some people who don’t like family gameplay as much will just age the babies up all the way to child the same day they’re born…