We recommend choosing a nappy size by weight, and you can find this information on our nappy size guide. Some common signs that it might be time to size up are:
The nappy starts to leak
You’re changing their nappy more
If the tabs no longer stretch enough to fasten comfortably over the hip
The nappy feels tight around the waistband, leg cuffs or is starting to leave red marks on their skin
You can’t run a finger inside the waistband when fastened
For more tips, head to our size guide and watch our Nappy Fit Check video.