Turning back time?

Yesterday, when R turned 9 months, hubby and I brought out the book What to Expect The First Year .We realised we did not do some of the developmental games suggested in the book. For e.g, teaching R the anatomy of the face....Nose, Eyes, Mouth, Ears.... Hopefully, it's not too late to start now?! And we were supposed to "explain" everything to her, especially new things she comes into contact with....and obviously, I don't do that too often..... Would it have made a difference for her development, if I would have done so? Could we turn back time so that I can start over again?

Rachel has not put on as much weight as she's supposed to, according to the percentile graph. And obviously, I started worrying after weighing her in the baby clinic yesterday. The nurse reassured me that it should be fine, as R is really mobile and active now, and she is still on breast milk. I wonder whether I am feeding her enough? I wonder whether she is growing ok? All these questions!!!! Any good answers to them????!!!!