Take good care of your (infant) baby.
Estoy a su bebe in English means I am a baby.
Nuestra prima dio a luz su bebe hoy... Or nuestra prima tubo su bebe hoy...
Your friend (female) translates very well.
Your my everything
To say congratulations on your baby boy in Spanish you would say, felicidades por su bebe. To say congratulation on your baby girl you would say, felicitaciones por su bebe.
It means: "I want to have your baby".
What you have written is --- Your spanish I'm very good What is correct is Su espanol es muy bien --- your spanish is very good Or Su espanol esta muy bien --- your spanish is very good.
Como esta tu/su bebe (informal/formal)
No se le ve bien la rodilla / su rodilla no está bien (a / de ella)
¿está bien venir a su casa ahora?
Do not give your baby bottle or food before the doctor has seen them.
For your sake in Spanish is "para su motivo." I really think "por su bien" is a better translation, "para su motivo" sounds a little weird in spanish.