By now, my baby's physical developments are coming fast and furiously. I place her on her stomach, she extend her arms and legs and arch her back, and when on her back, she' lift her head and shoulders. I hope she sit momentarily without assistance –soon. However, to provide support and surround her with pillows to cushion a possible fall. Encourage her to play face-down on the floor: lifting her head and chest to see toys or my face helps strengthen her neck muscles and develops the head control necessary for sitting up.When I support her under the arms while letting her balance her feet on my thighs, she has bounce up and down. And I like to put her in the corner of sofa for training her sitting.