Your Baby At Four Months Old 1. Weight: On average, a baby of four months weighs 6 to 6.5 kg and measures a little more than 60 cm (on average, 61 cm for girls and 62 cm for boys). But babies grow up at their own pace. For four-month-old girls, the 'standards' established in the health book range from 4.7 to 7.3 kg for a height between 57 cm and 65 cm.As for 4-month-old boys, a weight between 5.1 and 7.7 kg for a height of 57.5 to 65 cm is considered normal.2. Feeding a four-month-old baby: On the feeding side, a four-month-old baby only needs milk to be healthy, and cannot eat solid foods because of insufficient teething. According to its rhythm, baby is at 4 or 5 feeds a day, breast or bottle. The bottle can contain your own milk extracted with a breast pump, or infant milk appropriate to their age (you have to switch to infant milk when baby begins to eat a meal without milk a day).Usually, each bottle must contain 180 ml of milk (5 bottles per day) or 210 ml of milk (4 bottles per day). Usually, baby dietary diversification starts around 5-6 months, but if you wish and in agreement with your pediatrician, you can start introducing them to new flavours from time to time.For example, you can blend cooked carrots into a smoothie, and add a small teaspoon of this homemade puree in a bottle. Mix well until you obtain a homogeneous result.Note: in any case, baby dietary diversification should never begin before the age of four months due to the risk of food allergies. Whatever your baby's age, always ask for advice from your pediatrician before changing their diet.3. Sleep patterns of a four-month-old baby: A four-month-old baby has usually found their sleep pattern and is no longer hungry in the middle of the night. However, again, each baby changes at their own pace - if they do not sleep yet, follow the same ritual of bedtime every night to help them fall asleep (for example: bath to relax and lullaby, bedtime).You can also seek advice from your pediatrician. It can also happen that baby wakes up briefly during the night. Tip: do not talk to them, and leave them in their cradle. There is a good chance that they will stay calm and go back to sleep after a few minutes.