The size guide is a general guide and gives you the opportunity to compare sizes and measurements. Please keep in mind that measurements are are approximate and may vary slightly from color to color.
If your child has turned 2 years and a bit, or has extra cosy thighs, or is tall for her age, then maybe you should go for a size 3-4, to be on the safe side. Size up if you are unsure. The child will eventually grow into it.
Size 1-2 years fits most babies earlier as you can wear them as bloomers over a diaper and tuck in the tank.
If the fit around the leg is a little tight then give them a gentle stretch before putting them on.
Any questions please contact our customer service at firstname.lastname@example.org.