If your baby has red marks along their thighs, that's a telltale sign that the diapers are too snug. The elastic around the leg should have some stretch, but if the diaper is too small, it won't fit properly and will create these red marks. This is definitely a time to move up a size in diapers.
How long do most babies wear size 1 diapers?
Most babies use size 1 diapers within the first month or two after birth. Babies stay in size 1 diapers for two to four months after they start using them. If your baby started using size one diapers at birth, they should wear this size for two months.
Wearing diapers that are fastened too tightly can trap moisture, which can cause diaper rash. Diapers that are too tight may also cause rubbing and irritation.Jan 10, 2020