According to the search results, the average weight of a 4-month-old baby is around 14.2 pounds for girls and 15.4 pounds for boys. However, it is important to note that this is just an average and healthy babies come in all shapes and sizes. If a babys weight is in a lower percentile, it does not necessarily signal a problem with their growth or physical development. It is also common for babies to lose around 10% of their weight shortly after birth, but most babies gain back this weight within 1 week. Babies grow and gain weight the fastest within the first 6 months of life, and they tend to gain around 1 to 1.25 pounds in weight per month. Here is a breakdown of average baby weights in the first year according to the World Health Organization (WHO) :

• Birth: 3.5 kg (7.8 lbs) for boys and 3.4 kg (7.8 lbs) for girls
• 1 month: 4.4 kg (9.7 lbs) for boys and 4.2 kg (7.8 lbs) for girls
• 2 months: 5.2 kg (11.5 lbs) for boys and 4.8 kg (10.5 lbs) for girls
• 3 months: 6 kg (13.2 lbs) for boys and 5.4 kg (12 lbs) for girls
• 4 months: 6.7 kg (14.8 lbs) for boys and 6.2 kg (13.7 lbs) for girls

It is important to remember that these are just averages and that healthy babies come in all shapes and sizes. If you have any concerns about your babys weight or growth, it is best to consult with a healthcare provider.