Let me share my son's shaving process first.
Our baby's fetal hair was shaved late, so we shaved it for the first time when we were 4 months old because we were worried that it was too small to shave.
When shaving, you should find any hair salon and choose an experienced barber (preferably an older barber, we can't find one, so we have to find a barber who looks very skilled), and they will know when shaving fetal hair.
When I shave, I use an ordinary electric hair clipper to shave men's heads. Let the baby sit on mom or dad's lap and surround it with a piece of cloth to shave. Babies usually get scared when they shave for the first time. Adults holding the baby can calm the baby down.
After shaving, our rule here is that children must give the barber a red envelope for the first time to shave their fetal hair.
Then take the baby home to wash his hair and face.
If you buy yourself a hair clipper and shave your baby at home, it's the same. The key points are: hold the baby on the adult's leg, hold his head steady, calm him when crying and control him not to move to avoid accidents.