2 pairs of larger size (probably 3-6 mth) the narrow stripe ones were knit on 2.25mm the others which is a thicker yarn, on 3mm.
The pattern originates from one of Ma's old booklets - which is so fragile, half the pages fall out. The book is 'Beehive Baby Book - knitting for the first 6 months' it cost 1' and is numbered sc34 - I tried to find it online but couldn't. The original was knit on 3 ply on number 13 needles. I adjusted the pattern to knit a smaller sock on bigger needles with thicker yarn. It worked out really well.