Parenting: Baby's Clothing Tips Based on Temperature - as part of the expert series by GeoBeats. Natural fibers are a really good choice for a babys' clothes because they breathe. Babys' body temperature can go up and down pretty quickly. Layers are always a good idea. And it is really always a good idea to kind of match it to what you are wearing. I see people who have their babies bundled up in incredibly warm clothing on a day when maybe their wearing shorts themselves. So your baby does not need all that if the ambient temperature is enabling you to be dressed in just one layer of light clothing. But natural fibers and layers are the easiest way to accommodate changes in temperature.