Quickly, booties

A quick project as a gift for a baby that will be arriving shortly. The ubiquitous Saartje's booties pattern. It's popular for a reason. Very easy to follow, with a nice result, my only complaint is the vague sizing, since I myself am certainly no expert in baby foot sizes. How long is a baby's foot? I used a thicker yarn than called for (Mirasol Samp'a 50 g is 110 m), but tightly on quite small needles (2.5 mm), and knit the small size. The booties are 8 cm long. Probably bigger than a baby's foot?
Well, one thing babies can be trusted to do is grow, and they (the booties, don't know about babies) look cute: