Have you tried clicking the crib and selecting "Grow up" (or something similar to that)
If that doesn't work wait until it tells you that the baby's birthday is today (tomorrow) and it should age up automatically then.
If the glitch continues you could always try and revert to an earlier save point and go through the process again.
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Not very long about 2 days if you play it a lot
Only the baby can grow up. Which is 3 days. The boy or girl Sim(child sim) can't grow up.
Sims 2 double deluxe? yes sims 2 children grow up.
no they don't grow to toddler's, it is baby's then kids and they stay as kids but some say the grow into adults after kids but I'm not sure? :)
Babies growing up has nothing to do with ambitions. They just grow up like any other sim. If they're not aging at all then make sure you have Enable Aging on, but they should just grow up on their own.