Diaper Sizes 2 to 5: Fit Signs and Print Picks for Parents
By Honest Baby and Beauty Company | The Honest Company | Published: 2026-11-01
Category: Buying Guides
Learn how to choose diaper size for baby using weight ranges, fit signs to size up, and the print options in Honest Clean Conscious Diaper sizes 2 to 5.
Quick answer
Start with the weight range on the pack, then let fit signs decide: if you see gaping at the legs, red marks, or frequent leaks, move up. For most babies, size 3 fits the crawling stage and size 4 fits the pulling-up stage, but the print you choose should match the size that actually fits.
Why weight ranges are a starting point, not a rule
Diaper size charts give a weight range, but babies of the same weight can carry weight differently in the thighs and waist. A baby with chunky thighs may need to size up before the weight limit, while a long, lean baby may stay in a smaller size longer. Use the chart to pick your first pack, then treat fit signs as the real test. If you are between sizes, buy a small pack of the larger size to compare before committing to a case.
Size 3 vs size 4: what changes beyond the number
The jump from size 3 to size 4 often happens when babies become more mobile. Size 3 tends to suit crawlers and early walkers, while size 4 gives more room for toddlers who are pulling up and climbing. The absorbency needs also shift as babies sleep longer and drink more. If you notice leaks at night in size 3 but the waist still fits, try a size 4 for nighttime before switching entirely. The print options also change by size, so check availability if your baby has a favorite design.
When to move up: fit signs that matter more than weight
Red marks around the waist or thighs are the clearest sign the diaper is too tight. Gap at the legs, sagging in the front, or leaks that escape up the back usually mean the diaper is too small or the fit is off. If you are already using the largest setting on the tabs, size up. If the diaper looks baggy and leaks happen at the legs, you may have sized up too soon. Give each new size a few days of daytime testing before using it overnight.
Decision rules for choosing and moving up
- Start with the weight range: Check the weight range on the pack and pick the size that includes your baby's current weight. If your baby is at the top of the range, buy the next size up as a backup. Weigh your baby monthly until 12 months, then every few months.
- Test fit signs for 3 days: Use the new size during the day for three days. Watch for red marks, leg gaps, and leaks. If any appear, adjust the tabs first, then size up if needed. Take a photo of the fit from the back and side to compare.
- Choose size 3 or 4 by mobility: If your baby is crawling and mostly stationary, start with size 3. If your baby is pulling up, climbing, and sleeping longer stretches, try size 4 for more room and absorbency. Keep one pack of the next size for nighttime leaks.
- Match the print to the size that fits: Pick the print you like in the size that passes the fit test. If your favorite print is not available in that size, do not size up or down just for the design. Check the size and print options before buying a case.
Honest Clean Conscious options in sizes 2 to 5
- Honest Clean Conscious Diaper®, Multi-Colored Giraffes, Size 2: Size 2 in Multi-Colored Giraffes is OEKO-TEX® STANDARD 100 certified and third-party tested for 350 harmful chemicals. If you are sizing up from newborn and want a verified safety standard, this gives you a clear starting point for delicate skin.
Honest Clean Conscious Diaper®, Multi-Colored Giraffes, Size 2 - Honest Clean Conscious Diaper®, Barnyard Babies, Size 3: Size 3 in Barnyard Babies uses Comfort Dry Technology and is described as the softest diaper yet. For crawlers who are active and prone to leaks, this is a practical choice to test fit before moving to size 4.
Honest Clean Conscious Diaper®, Barnyard Babies, Size 3 - Honest Clean Conscious Diaper®, Space Traveling, Size 4: Size 4 in Space Traveling is available for toddlers who need more room as they become more mobile. If you see red marks or nighttime leaks in size 3, this gives you a larger option to compare without changing brands.
Who this guide is for
Best for
- Parents transitioning from newborn sizes to size 2 or 3
- Caregivers deciding between size 3 and size 4 for a mobile baby
Not for
- Parents who need preemie or newborn sizing
- Babies with medical fit needs that require a specialist's advice
