Hi Shanaz! What a cutie you have!!!!
We put Natalie on her tummy from Day One (once we got home from the birthing center, anyway - they were less than thrilled with it...). She slept on her tummy (NOTE: this is a personal decision!) from the time she came home with us, and she spent lots of time every Awake period on her tummy. She did have reflux, so we'd keep her upright, in a bouncy chair once she could sit in it, for a while, and then on the floor she went. We'd sometimes also put her on our bed; we have a lightweight but firm quilt we use for summertime (as opposed to the wintertime poofy comforter) that was good for her to scootch herself forward on if we put our hands behind her feet, and on the floor she went on the naugahyde surface where we did the same thing.
FWIW, she was crawling on her hands and knees just before 5 months and is now walking independently all over the place (as of a few days ago), and she'll be one in a couple weeks. And when she had a nasty croupy cough over the winter and had to go in to the doctor for it (and spend SIX HOURS for nebulizers and shots
), even though she was clearly uncomfortable with the cough, she had 100% oxygen saturation, meaning she was getting more than enough oxygen - her respiratory system was in great shape!