See Joy's comment above.
Also, I don't think a lot of people uses this anymore. If you have the EP Pets or a later one, you can use proper changeable clothes for infants with a mod, which is a lot less likely to cause troubles ingame. The mod was made by Chris Hatch at BAS, but is available
here.
There ae a few other outfits at MTS (
here), and a few spread around the net. I've also got a big collection of baby clothes on my site, including changeable hairs and accessories for babies.
