6-Month-Old Baby Weight & Length Chart
Six months is a major milestone — most babies have doubled their birth weight by now. This is also the green light to introduce solid foods alongside breast milk or formula.
Boy — 50th %ile
Girl — 50th %ile
⚖️ Weight by Percentile
| Percentile | 👦 Boy | 👧 Girl |
|---|---|---|
| 5th Percentile | 14 lbs 9 oz | 13 lbs 7 oz |
| 10th Percentile | 15 lbs 3 oz | 14 lbs 2 oz |
| 25th Percentile | 16 lbs 1 oz | 14 lbs 16 oz |
| 50th Percentile (median) | 17 lbs 7 oz | 16 lbs 1 oz |
| 75th Percentile | 18 lbs 12 oz | 17 lbs 3 oz |
| 90th Percentile | 19 lbs 10 oz | 18 lbs 1 oz |
| 95th Percentile | 20 lbs 5 oz | 18 lbs 12 oz |
📏 Length/Height by Percentile
| Percentile | 👦 Boy | 👧 Girl |
|---|---|---|
| 5th Percentile | 2' 1.7" | 2' 1" |
| 10th Percentile | 2' 1.9" | 2' 1.2" |
| 25th Percentile | 2' 2.3" | 2' 1.5" |
| 50th Percentile (median) | 2' 2.6" | 2' 1.9" |
| 75th Percentile | 2' 3" | 2' 2.2" |
| 90th Percentile | 2' 3.3" | 2' 2.5" |
| 95th Percentile | 2' 3.6" | 2' 2.8" |
📊 What Does My Baby's Percentile Mean?
A baby at the 50th percentile weighs more than 50% of babies the same age. The 25th–75th percentile range is considered average. Any percentile from the 5th to the 95th is medically normal — your baby's growth curve matters more than their rank. A consistently healthy 10th-percentile baby is thriving; a baby who drops from the 70th to the 30th percentile warrants a conversation with your pediatrician.
🌟 Developmental Milestones
- Sits without support (briefly)
- Transfers objects between hands
- Responds to own name
- Begins solid foods
Starting solids is exciting but messy. The goal at 6 months is to explore tastes and textures — calories from food are secondary to breast milk or formula until 9–12 months.
🍼 Feeding at 6 Month Old
Start single-ingredient purees or soft finger foods. Continue breast milk or formula (it remains the primary nutrition source until 12 months). Offer solids once per day at first.
🚨 Talk to Your Pediatrician If…
- Doesn't reach for objects
- Shows no affection for caregivers
- Doesn't respond to sounds
- Difficulty getting food to mouth
Frequently Asked Questions
How much should a 6-month-old weigh?
WHO median is 7.9 kg (17.4 lbs) for boys and 7.3 kg (16.1 lbs) for girls. Most babies at this age weigh 6.6–9.2 kg (14.6–20.3 lbs).
When do babies double their birth weight?
Most babies double their birth weight by 4–6 months and triple it by 12 months. A baby born at 7 lbs would expect to be around 21 lbs by their first birthday.
Should I start with purees or baby-led weaning?
Both approaches are safe and evidence-based. Purees are traditional; baby-led weaning (soft finger foods from the start) is gaining popularity. Many families combine both methods.
What foods should I avoid at 6 months?
Avoid honey (botulism risk), cow's milk as a drink (though dairy products like yogurt are fine), added salt and sugar, and choking hazards like whole grapes or nuts.