that is one of the downfalls of The Sims 3, ugly maternity clothing. your sims can't change their maternity clothing.. it is unfortunate
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you cant, the maternity clothes just appear on your pregnant sim not for teens! and you can get some at poppy sims
You can probably get clothes from the Sims 3 website with real money, or download the sims that people make
'that is one of the downfalls of the sims 3, you can not change your sims' maternity clothing.' that is not necessarily true... if you know your sims is gonna get 'knocked up' then go to plan outfit, and choose the funny t-shirt and tracksuit bottoms and then the frumpy looking dress lol. or.. see if you can download some clothes that the sims 3 didnt create but someone else did, that's what i did and now i have nice clothes instead, i downloaded a sim that someone made and they had custom clothes and custom clothes work as well. i know its long but good luck !
When you enter your room which is in your house go to your wadrobe. There you can get different clothes all shapes,colors, and sizes!
I think 2 to 3 days. You will not see the dog psychically change however.