Your baby may start gaining almost as much as 1kg a month at this stage (although this will slow down as he gets closer to his first birthday). Your health visitor will use standard growth charts to track your baby's weight gain but don't get too obsessive about these measurements. As long as your baby has a good appetite, is growing at a steady pace and your health visitor says all is well, it doesn't matter what percentile she's on. If your baby has just started smiling, you can take advantage of her new ability to show joy by making her grin and giggle. Silly faces, funny noises and blowing bubbles are all tried-and-tested hits with tiny babies.