Which one of these is not like the other?

These pictures are all taken of my kids at or around the age of 7 months:

Asher

McKlayne

Oliver

When Oliver was first born we thought he looked exactly like McKlayne as a baby, but the older he's gotten, the more he resembles that older brother who is head over heels for him.   He definitely takes third place in the amount of hair...but it's starting to grow in very quickly.