There’s a tiny but possibly confusing error in the pattern:

When you start working the lower foot, after picking up the first set of stitches along the selvedge it says: ‘with new double pointed needle, k22 (24, 22) stitches from Needle 2’

This should be:
’with new double pointed needle, k16 (16, 20) stitches from Needle 2’ = the stitches you’ve put aside for the heel.

Second pair I made for baby Ricky, my cousin puts the first pair on his teeny tiny feet every day since she got them, so now she can alternate pairs.