At four and a half months our little guy is very busy! He keeps me on my toes all day long with his constant rolling over (both ways):) across the living room floor.He also has discovered that he can reach for his toys and and push himself towards them.Teething has been very trying for Mom and Dad...waking up at night crying and chewing and drooling:( poor baby. I am remebering to cherish all the sweet moments with him..it sure is going WAY to fast!