Okay, let me throw my hat in!

DD7-PG didn't walk until 14 months. I see a lot of Ruf's level 4 and 5 stuff with her. She did question Santa by 3. BTW another friend's child who is PG point blank looked at the fireplace and stated, no way Santa was going to fit down that. And I think she was 2, if I remember correctly.

DD5-HG walked at 9 months, running at 10 months, mostly running away!!!!!!
Could read sentences before DD7 but then didn't want to read til 5yr 5mo and has quickly just about caught up to where sister was at this particular age.

So,,,,I don't know.

They're all different.

Incog