Boys Weight chart in kgs for babies 4 month old baby

Weight chart for 4-Month-Old boys

Tracking your child's weight against the standard range for baby boys.

Weight percentiles for 4-Month-Old boys

Based on CDC and WHO reference data, weight percentiles for baby boys at 4-Month-Old are:

• 5th percentile: 5.2 kg

• 25th percentile: 5.9 kg

• 50th percentile (median): 6.4 kg

• 75th percentile: 6.9 kg

• 95th percentile: 7.8 kg

The percentile values on this page are displayed in kg.

Percentiles rank your child's measurement against a reference population of baby boys. The 50th percentile is the midpoint - half measure above it and half below.

Weight and development for baby boys

By four months, most babies have doubled or are close to doubling their birth weight. This dramatic gain reflects the extraordinary caloric efficiency of breast milk and formula during this phase. The pace of weight gain now begins to slow relative to the first weeks.

Reading the growth chart correctly

Growth charts show a range of normal: being at the 10th percentile is just as healthy as being at the 90th, as long as growth is consistent. What matters is the pattern over time, not the absolute number. If your baby's weight crosses two percentile lines downward over a period of weeks, ask for a review at your next health check.

Signs that feeding is going well

If your baby is gaining weight consistently, producing at least 6 wet nappies per day, feeding frequently, and seeming settled after most feeds, they are almost certainly getting enough. Day-to-day variation in feeding amounts is normal. Breastfed babies may cluster feed in the evenings or during growth spurts without this indicating insufficient milk supply.

Frequently asked questions

How does breastfeeding affect weight gain?

Breastfed babies tend to gain weight more rapidly in the first 3-4 months compared to formula-fed babies, and then more slowly from 6-12 months. Growth charts derived from breastfed populations (WHO standards) may show slightly different percentile placements than older CDC charts. A healthcare provider can advise on which chart is most appropriate for your baby.

How much weight should a baby gain per week?

In the first three months, most babies gain around 150-200 grams per week. This slows to approximately 100-150 grams per week between 3-6 months, and around 70-90 grams per week from 6-12 months. These averages vary between individuals - what matters most is whether the overall trend is upward and consistent.

Is my baby gaining enough weight?

A baby who is feeding well, producing at least 6 wet nappies per day, appearing alert and content between feeds, and gaining weight consistently is almost certainly getting enough. A baby who is losing weight after the normal early dip, or who has not returned to birth weight by day 14, should be reviewed by a health professional.

Data sources and methodology

The percentile ranges on this page are drawn from CDC growth chart data from the National Center for Health Statistics and WHO Child Growth Standards (for children under 5). CDC data published May 30, 2000, with 2022 extended BMI tables. Percentiles are modelled using the LMS method (Box-Cox transformation), which accounts for the skewed distribution of measurements at each age. All measurements are given in metric units with imperial equivalents.

For any concerns about growth or development, consulting a registered health professional who has access to the full growth record is always recommended.