Here are some custom content sites.
There are plenty more sites than this. If you want more just Google "sims 3 custom content".
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Limewire has some!
Mod the Sims has a large selection of hair and makeup, XMSims has some excellent custom hair colors and styles.
yes on sims 2 offical There is nothing, official or not, in the Sims 2 that Sims can place infants and toddlers into that can be pushed around by the Sim (no prams/baby carriages, no strollers). The crib from the base game is made to look as though it has wheels, but this is a decorative feature only; the crib can only be moved by the player within Buy/Build mode. There are some custom content objects that look like prams/carriages, but these have been cloned from cribs and offer no additional functionality.
'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 !
There are no My Sims Kingdom cheats. But there are some for clothes. But not for gameplay.