Adjusting to baby brother

Sam is in an adjustment period right now, getting used to finally having the baby home (it's been 6 days) and learning what that's like. In some ways he's helpful and quite observant. He's always bringing me Andrew's pacifier when he finds it somewhere and says "Baby, baby." He also likes to bring Andrew his blanket and offers up his toy cell phone to him to talk on. He goes around labeling all the things that belong to baby (car seat, chair, bassinet, changing table) and alerts us whenever Andrew starts crying by shouting choruses of "Baby, baby." On the other side, he's testing out limits with Mom and often does things he knows he shouldn't just to get a reaction (climb up the end of the couch, stand on a chair, bite, head butt). He started experimenting with doing these behaviors while Mom is nursing, to see if she'll actually put baby down and stop Sam (answer is yes, she will, so don't think she's immobile). I'm trying to make sure to put in quality play time with him and he's getting lots of attention and outings with his grandparents as well. Luckily the baby is sleeping so much he doesn't require a lot of attention right now, so I can spend time focusing on Sam too. One thing that warms our heart is he's learning to say Andrew's name: "Ah-ew" and enjoys gently stroking his hair or foot (with one finger to ensure gentleness).