Your Baby At Nine Months 1. Weight: The average weight of a nine-month-old baby is 8.7 kg. In practice, the 'normal weight range' for a nine-month-old boy is between 7.5 and 11.5 kg. That of little girls goes from 7 to 11 kg at the same age. As for the average size of baby, it is 71 cm. During this month, baby will still grow and gain weight. Weight gain is quite significant at 9 months: usually a little over 500 g.2. Feeding a nine-month-old: Baby is not quite eating like a big kid yet, but their diet has already diversified: even if they still need at least 500 ml of milk a day (infant formula, or breastmilk), they also eat vegetables and cooked fruits, a little meat and fish (no more than 20 g of animal protein per day), legumes (such as lentils and beans), yoghurt, etc.At around eight to nine months, their teething also allows them to eat more 'hard' foods such as ripe raw fruits for example. You can also introduce new flavours to your nine-month-old baby by adding a little garlic or herbs (eg chives) to their meals.As a general rule, baby food is divided into 4 feeds during the day (2 bottles + 2 meals): a bottle for breakfast, a lunch mostly made from vegetables (also with a little animal protein and a dessert made from fruit or dairy), a small snack (dairy or fruit) and a bottle at dinner (milk, or a mixture of milk and vegetable soup).3. Sleeping pattern at nine months: The need for baby to sleep continues to decrease so that the late afternoon nap can completely disappear around nine months. However, it is far from systematic, each baby has their own sleep pattern. Of course, the same can be said of adults...In practice, a baby of nine months will usually take two or three small naps during the day. They will usually sleep through the night unless something is bothering them, teething for example.Baby can also be plunged into the 'eighth month anxiety': in this case, they can 'claim' you during the night or have trouble falling asleep. A blanket and a bedtime ritual are often enough to comfort baby during this delicate phase which is necessary for their psychological development. If necessary, you can also ask your pediatrician for advice.