Cute baby...but I am confused...is her name Anna, or Ema? As far as photographing babies of her age--a car seat is an excellent posing aid, especially when covered with a nice throw, wrap, or blanket...preferrably one that GRANDMA bought for the baby! The car seat keeps a young infant safe, confined, and upright during the stage of development when they tend to topple over and can not yet really sit up independently. In a professionally-equipped studio, there will be one or two purpose-built devices called a "baby poser' and a "baby posing table"... the latter of which is a foam-padded table with a depression and a high backrest, kind of like a small "throne", where an infant can be placed on a big throw, then placed in a corner or against the back-rest(depending on the baby's capabilities), sitting upright and leaned back just ever-so-slightly. For really YOUNG infants, like newborns, some of the ridiculous poses MWACs are doing are a lawsuit just waiting to happen.
Nothing wrong with photgraphing a baby in a car seat...but...it looks a LOT better with a decent fabric placed over it...