Abigail was 15 months when Sophia was born. She is 100% absolutley in love with her little sister. She kisses her, hugs her, gives her food and a pacifier (rather tries to), tries to pick her up to hold her, pats her head gently, gazes lovingly into her eyes. Except for the moments when Abigail gazes at me, I've never seen such a look of love in her eyes other than when she looks at her little sister. She signs baby, points at her, says Sophia, knows her by name and by baby. She has even tried to 'help' me nurse Sophia, by pushing my breast toward Sophia. Abigail is cuddlier in general, wants my lap whenever I'm nursing Sophia. I just give her all the cuddles she wants and she is happy with that. When she is tired and crabby, she threw things at me and Sophia, and I told her no hitting, that hurts, would remove object, distract her with something else, and worst case, would have to nurse standing up. Abigial seems to be passing that phase, though.
I really am amazed at how wonderful Abigail is with her little sister, how loving and caring she is.