Its easy when you know how
For the rise measurement, measure OVER his biggest nappy from his belly button round, under his legs to the same point at the back...so pretty much from the front of his nappy through his legs and to the back of his nappy...
Hips, Measure OVER the nappy around his hips
Waist, measure above the nappy around his waist.
For comparison so you can get an idea of your measurements are right, my chunky 6 months old is~
Let us know if you need more help!1