Bichons begin to lose their fetal hair 3 months after birth and will last for 3-6 months. During the period when the Bichon Frize is losing its fetal hair, the owner can trim the dog's hair to a length of 2 cm. When the Bichon Frize reaches 9 months old, the original fetal hair will be replaced by thick and curly hair. Highly nutritious food can be added to the diet to promote hair growth.