It can take several months for baby hair on the front of the forehead to grow back to its normal length after shaving it. The rate of hair growth can vary depending on factors like age, genetics, and overall health.
On average, hair grows about half an inch (1.25 cm) per month, which means it can take several months for hair to grow back to its original length after being shaved. However, keep in mind that baby hair is typically finer and thinner than adult hair, so it may take longer for it to grow back fully.
To promote healthy hair growth, be sure to eat a balanced diet that is rich in vitamins and minerals, avoid harsh hair treatments like chemical relaxers or color treatments, and use gentle hair care products that are free of sulfates and other harsh ingredients. You can also try using hair growth treatments like minoxidil, but be sure to consult with a doctor or dermatologist before using any new product on your hair or scalp.