Solved
Sims won't blow candles
I try to age up a Sim because it is her birthday. I click on the cake. I click the "Blow out candles" option. Her name does not appear on the list. This has only happened once, as I tried to age a Sim from Young Adult to Adult. I should add that this Sim is pregnant and her name is the only one that does not appear (other Sims appear on the list).
@TomT123456 Pregnant sims can't age up even if they're over the age limit for their bracket. You'll need to wait until she gives birth.
