1. When to give a baby a haircut? The timing of a baby haircut varies based on family habits and the rate at which your child\’s hair grows. Generally speaking, newborns\’ hair is relatively sparse and does not need to be trimmed; around 3 months old, some hair begins to grow, so trimming can be considered; around 6 months old, the hair is thicker and requires frequent trimming. 2. How to give a baby a haircut? exist