At the beginning I used needles number 2 - it was too tight, so I switched to 2.5. But I left the rib.
Then I changed the number of stitches and used size 2y (my son’s 9 months old) from the pattern because the thread is really thin.
It’s my first pair of socks, and even though they could look more beautiful and bigger, because they came out too small I’m still proud like hell :-)