Aren't they so cute?
I hope they won't be too small for poupik when he decides to come out.
I used a hook of 3.5 mm size.
When stitching the soles together, I used a hook of 4.5 mm and loose stitches in order to ease the beginning row of the shoe body. An important lesson I had, is that the work of the body is done CLOCKWISE, a critical information that I mistakenly ignored on my first 2 trials and I couldn't understand why the 2 booties where coming out so distorted??! I used a double cotton yarn to reach the proper gauge. For the strap, I added a one thread round with 2 mm hook of sl-st in the circumference, as I've seen several did in the finished Ravelry projects gallery.
For additional helpful information, check this link. One more lesson to take for the next booties is that I may need to try what roofth had said with regard to the shoe body , starting probably at the 5th or 6th stitch from the right instead of the 4th, in order to get the DCtog better aligned at the center of the booty for size number #1.
Finally, I find the result just adorable. Great design!