Anyone?

Km • 27. Married 5 years. Our daughter Stella Claire is our entire world. Born Nov 15. 2015. Pregnant with #2 due in April.
Anyone's 3 month old (12 weeks), not cooing/babbling or laughing yet? She also doesn't grab for toys or rattle anything. I'm concerned. We talk to her all the time. She smiles and can hear and follow us but she's such a serious baby.