Anyone else with more than one kid who has noticed this? The younger kid just seems to be growing up much faster! Mine is hitting his developmental milestones much sooner than i expected him too. It’s almost like he can’t wait to join his brothers in everything that they are doing. Whether it is books, cars or the tambourine, he wants to be a part of the action. He is just a little over 5 months old and is creeping/crawling across the room to join the action. This afternoon he spent a long time crawling to a ball, pushing it, watching it roll and then chasing it once again.