When does the soft spot harden?

The soft spot, known as the fontanelle, on a baby's head typically begins to harden between 9 to 18 months of age. The anterior fontanelle, located at the top of the head, usually closes by around 18 months, while the smaller posterior fontanelle at the back often closes much earlier, generally by 2 to 3 months. This process allows the skull to grow and protect the developing brain while accommodating delivery through the birth canal. Regular pediatric check-ups monitor the closure of these soft spots to ensure healthy growth.