how to choose what kind of baby barber trimmers need to buy it?

Baby born president has a thick hair, and the full moon in the country has for the first argument, the baby born will be very thin hair like adult hair so hard, quite. We managed to teach their lanugo hair,Usually lanugo need to shave the hair re-grows new, some babies studio will provide free service for lanugo, but after the baby haircut becomes an issue, and it has not closed to the baby barber barber shop in the market,Most of the baby is the mother to give them your hair at home, which requires a best professional hair trimmer haircut at home before
they can reach the goal, then the Barber how to choose what kind of baby barber trimmers need to buy it?