The Sims 3 Breastfeeding Mod -

Some mods may cause certain outfits to "clip" or look strange during the animation.

Find a reputable version of the mod (CmarNYC’s "Breastfeed Baby" is a community staple). the sims 3 breastfeeding mod

The mod is coded to satisfy the infant’s hunger motive just as a bottle would. Some mods may cause certain outfits to "clip"