Track your baby’s weight progress clearly and confidently.
Enter birth weight, current weight, and days since birth to calculate:
- Total weight change (grams)
- Average daily gain
- Percentage change from birth weight
This tool is for informational tracking only and does not replace medical advice.
Calculate Baby Weight Gain
Newborn Weight Gain Reference (0–3 Months)
| Stage | What’s Normal |
|---|---|
| Day 1–5 | Up to 7–10% weight loss |
| Day 10–14 | Regains birth weight |
| 0–3 Months | 20–30 g per day average gain |
| Weekly Average | 150–200 g per week |
These are general reference ranges. Individual babies may vary.
Understanding Newborn Weight Changes
In the first few days, most newborns lose 7–10% of their birth weight. This is normal due to fluid loss.
By day 10–14, babies typically regain their birth weight.
After that, average weight gain in the first 3 months is:
- Around 20–30 grams per day
- Roughly 150–200 grams per week
Every baby grows at a slightly different pace. Consistent gain matters more than comparison.
When to Speak to a Doctor
- Baby has not regained birth weight by 2 weeks
- Daily gain consistently below 15–20 g after day 10
- Baby seems lethargic or feeds poorly
- Fewer wet diapers
What Actually Affects Weight Gain
- Effective latch
- Feeding frequency
- Milk transfer (not just time at breast)
- Illness
- Prematurity