can't age up infants with birthday candles

hi! recently in my game, I was throwing a birthday party for one of my infant sims to age her up to a toddler. she was designated as the birthday sim in the party. her mother made a cake and added the candles, but there was no option to help the infant blow out the candles. I hit the "Age a Sim Up" option from the pie menu, and she didn't pop up there either. i tried this with both aging on and aging off, and neither provided a solution. I had to age her up manually through MCCC, but I'm wondering if anyone else has experienced this issue recently or could offer a solution to the problem. thanks!