My m at 3.5 Months

My little m ahs and coos.  When she starts "talking", I talk back and sometimes try to immitate her.  Lately, when I try to make the noises she makes, she laughs at me!  I think she thinks to herself, what a silly mom!
She is still very "pushy" with her legs.  Maashaalaa she has really strong legs, when she starts kicking, one better duck.  She rolls now, and she pulls herself up to her midback craining her neck.
She still adores A.  Follows him around the room, even quiets down if she is crying.
She has started waking up too frequently in the middle of the night again and not going back to sleep.  I am sleeping even less and amazingly I feel completely numb to it.
When A was this age I used to read to him.  But I have not starting doing so with m yet and I am not happy with it.  It needs to be fixed!
She doesn't like sitting in her stroller.  She much preferred being carried in a baby carrier, facing out and watching the world.  I take daily/nightly walks with her and as she is growing bigger and heavier, the weight on my back is becoming harder to bear.  I feel I am losing hight under the weight!...