i don’t know if all infants to it and it’s a little hard to tell from this photograph, but we’ve noticed that as long as odin has his basic needs met ( i.e. not hungry and not tired etc. ), if you stand him on his toes, he’ll respond with a big grin; he does it consistently enough that it makes me wonder if there’s a reflex or instinct at work that makes standing on one’s toes an inherently fun thing to do when you’re such a wee one.

i suppose that most of the time when we’re standing him on his toes we’re making big, expressive smiley faces and talking to him, so maybe we’re just confounding variables in the study.