See your baby size and development week by week during pregnancy.
See your baby size and development week by week during pregnancy.
This tool is being enhanced with additional features. In the meantime, explore our other free women health calculators below.
Babies grow fastest in the first year of life than any other time. Most babies double their birth weight by 4-6 months and triple it by their first birthday. Length typically increases by about 10 inches (25 cm) in the first year. Growth then slows into a steadier, more predictable pace through the toddler years.
Growth doesn't happen at a perfectly steady rate — babies often go through noticeable growth spurts around 2-3 weeks, 6 weeks, 3 months, and 6 months of age. During these periods, babies may feed more frequently, sleep differently, and seem fussier than usual for a few days before settling back into their normal pattern.
Physical growth is only part of the picture pediatricians track — motor, sensory, and social milestones matter just as much. Rough guides include: smiling responsively by 6-8 weeks, holding up their head steadily by 3-4 months, rolling over by 4-6 months, sitting without support by 6-8 months, and taking first steps somewhere between 9-15 months. These ranges are wide on purpose, since healthy development varies considerably between babies.
At each well-child visit, your pediatrician plots weight, length, and head circumference on a growth chart and compares the trend to your baby's own previous measurements — not just to population averages. A baby who's always tracked around the 20th percentile and stays there is generally considered to be growing well, since consistency along their own curve matters more than which specific percentile line they follow.
Medical Disclaimer: All tools on Bloom Health Woman are for educational purposes only. Always consult a qualified healthcare provider for medical advice.