Girls, what could your babies be doing at three months old? The differ…

Girls, what could your babies be doing at three months old? The difference between children is big, I forgot everything: (1) Daughter makes noise, babbles "goo, ma", etc. 2. She holds a toy but it's not interesting to her, she doesn't put it in her mouth. 3. Squeezes fists with fingers. 4. Laughs. 5. Turns over from back to stomach, only accidentally three times or with my help. Seems like that's all. It's confusing that she doesn't take toys into her mouth and they're not interested in them at all...and that she doesn't turn over from back to tummy ?