aging up a newborn in sims 4

Not quite sure what you ask? Do you have problems aging up a newborn to the infant lifestage? I think it can not be done right after the birth, there is some tech stuff there but I think it is by design. I'm not sure if it just need some time, like 3-4 sim hours, or if you need to interact a little with the baby. When I had problem aging it up it was normally possible after 4-5 interactions.