Between the age of four and seven months, your baby will continue to gain about 1 to 1-1⁄4 pounds (0.45 to 0.56 kg) per month.
By the time he is eight months old, he will weigh about two and a half times his birth weight. His bones will also continue to grow rapidly. Consequently, during these months their height will increase by approximately 2 inches (5 cm) and their head circumference by approximately 1 inch (2.5 cm).
Your baby’s growth rate
Your child’s specific weight and height are not as important as his growth rate at this time. Continue to keep a periodic record of their measurements to ensure that it continues to grow according to the curve that corresponds to it.
If you notice that your baby is starting to follow a different curve or is gaining weight or height unusually slowly, see your pediatrician.