At 4 months old, a baby boy typically weighs around 6.7 kg (14.8 lbs), while a baby girl generally weighs about 6.2 kg (13.7 lbs). These figures represent the 50th centile, meaning they are average weights for babies of that age.
Understanding Baby Weight at 4 Months
It's important to remember that every baby is unique, and their weight can vary based on several factors, including genetics, feeding patterns, and overall health. The weights provided are benchmarks, not strict requirements.
Average Weight Chart for 4-Month-Olds
The following table illustrates the average weights for babies at 4 months of age:
| Age | Average Weight for Baby Boys (50th Centile) | Average Weight for Baby Girls (50th Centile) |
|---|---|---|
| 4 months | 6.7 kg (14.8 lbs) | 6.2 kg (13.7 lbs) |
What Do Centiles Mean?
Centile charts are standard tools used by healthcare professionals to track a baby's growth. The 50th centile indicates that 50% of babies of that age and sex weigh more, and 50% weigh less. For example:
- A baby on the 25th centile weighs less than 75% of babies their age.
- A baby on the 75th centile weighs more than 75% of babies their age.
As long as your baby is growing consistently along their individual growth curve, and their weight gain is steady, there is usually no cause for concern.
Factors Influencing Baby Weight
Several elements can impact a baby's weight at 4 months:
- Birth Weight: Babies who were larger at birth may continue to be heavier, and vice versa.
- Feeding Method: Breastfed and formula-fed babies can have different growth patterns, especially in the first year.
- Genetics: Parents' body types can influence their baby's size.
- Overall Health: Any underlying health conditions can affect weight gain.
When to Consult a Doctor
While variations are normal, it's always best to discuss any concerns about your baby's weight with a pediatrician or healthcare provider. They can:
- Assess your baby's individual growth trajectory.
- Provide personalized advice on feeding and development.
- Rule out any potential underlying issues.
Regular well-baby check-ups are crucial for monitoring your baby's development, including weight, length, and head circumference, ensuring they are growing healthily. More information on baby weight and growth can be found on reputable sources like the National Health Service (NHS).
