shoe size

Ok this is just me being a bit curious.
Kailynn wore a size 0 shoe up until she was 7 mths old.
Now at 9 mths, she's just about outgrown her size 1 shoes.
Realized this last night when I put on her shoes so she could practice standing holding on to the wall. Doubt she'll be able to fit them next week. Their tight.
This is what I don't get. Why did it take her 7 mths to grow one size. And then after that, 2 mths to hit the next one??

What size did/does your LO wear at 9 mths. Take note, kailynn is on her way to a 2 shoe as of now. Are her feet growing to fast?

my son is 9 months old and wears a size 4.

My son was in a size 3 at 8 months and now a size 4 at 10 months. Which I doubt he'll last much longer. He's feet are huge.


My daughter, on the other hand. Was in a size 2 at 10 months and then went to a 4 at 15 months.

My daughter uses size 4 at 5 1/2 monthws. Still aliilte big so she can grow into them.

mine was in a size 3 at 9 months..size 4 at 13 months..your daughters feet are actually relatively small.

I've had the size 1 shoes since she was 4 weeks so she could grow into them, but it seems she's never really grown into them, just out of them.