Oh they are getting so big! Stella was 13.25lbs the other day. Vivi is over 15lbs! Wow! They are both doing so much now. They are definitely aware of each other and often I catch them smiling at each other and giggling. They are 6 months old next week. Both of them are rolling front to back and back to front. Vivi seems like she is so close to crawling. Both of them seem closer to sitting up every day. Vivi is very expressive with her eyebrows and Stella has the big Doe-eyes. Vivi's feet are ALOT bigger than Stella's. Both of them have spike-ish hair right now too. Oh they are so much fun. :)