aging babies up

Do the Quest  "A quest for Toddlers" to be able to bake a birthday cake and give it to the baby

It is a Main Quest, I assume you have done "Two and a Half sims", "A quest for toddlers" is a few quests after that. Here's a List of all main quests, I'll highlight  "A quest for toddlers"

List of Main Quests, have to be done in order

Tutorial

Bread Winner Quest

Money Grows On Trees Quest

Love Is In The Air Quest

Two And A Half Sims Quest

Ocean View Estate Quest

The Mysterious Island Quest

Raiders of the Lost Artifacts Quest, (Mysterious Island Monuments)

Need for Steed Quest

>>>>>>>>>>  A Quest For Toddlers  <<<<<<<<<<<<<

It’s All Going Swimmingly Quest

Hidden Unicorn Quest

In Da Clubhouse Quest

Preparing for Preteens Quest

Sous Judgemental Quest

An Alien Concept: Weather Machines Quest

Multi Story Renovations Quest

Teenagers Quest

Higher Education Quest

The Pirate and His Goddess Quest, (Pirate Ship Trading)

Road To Fame Quest

Adulthood Quest

Ghost Hunters Quest

Seniors Quest

Bird Feeding Quest

In Stitches Quest

Life Dreams and Legacies Quest ,(Ageing Update)

You can age them pretty much on your own pace. Sometimes you may need a baby for weekly tasks, but you can skip them for 1 LP.
After unlocking toddlers, your Sim can bake a birthday cake and age up your baby to a toddler.
 The schools don’t matter until you have preteens and teens.  They are only needed, if you want to send them to school. In SFP they don’t have to go. 

If you want to do the discovery quest  “Nanny knows best” you need a baby, because those tasks cannot be skipped.

At level 14 you unlock the progression quest “In da Clubhouse”. This quest requires a toddler. Some discovery quests also require a toddler. So, it’s a good idea to either have a toddler already or birthday cake ready to be used.

Discovery quests can be started whenever a player wants, until completing one is required for leveling up. Even then it’s your decision, which one you do. 

Hope, this helps 🙂

thanks for the help , i figured out i  havent gotten far enuff for it and havent done the quest yet. lol i was getting ahead of myself.