Having two kids, you can't help but compare them. My memory of Kiersta during her first month is probably spotty at best, but this is what I remember.
Kiersta was a horrible sleeper, still is. She was awake, alert, and crying much of the time (she had colic). She still cries more than her brother does! As a result of being up so much of the time, Kiersta had a lot more tummy time and her neck muscles were much more developed than Kyle's are at one month. Kiersta was also quite a bit more photogenic than Kyle is, not sure why though.
Kiersta at just over 1-month old
Kyle is a good baby, that's not to say that Kiersta wasn't, but they just have very different temperments (as most siblings do). Kyle tends to sleep away most of the day away and much of the night, too. He wakes up to eat and have his diaper changed. He tends to not cry much. He'll cry for short amounts of time, but once his needs have been met, he stops. Kyle is beginning to be awake for longer amounts of time but he is still not particularly demanding during those times. Kyle is cute (I'm obligated to say that as his mom), but he is not very photogenic. When I try to take his picture, he just looks a bit like David Cook.
Here's Kyle just after a bath
Kyle at one month old looking like David Cook