No.
Experts are of the opinion that shaving baby’s hair does not make it grow thicker. We are all born with a fixed number of hair follicles on our head. These follicles are present beneath our scalp and are basically sacs from which our hair grows. When you shave the hair on the surface it doesn’t affect the hair developing in the follicle.
The texture and volume of your baby’s hair is actually determined by genes.