Final answer:
A nurse would typically expect an infant to be able to say "mama" and "dada" with meaning around 12 months of age, coinciding with other developmental milestones like walking and understanding simple commands.
Step-by-step explanation:
The age at which a nurse would expect an infant to be able to say "mama" and "dada" with meaning is around 12 months. By this age, infants typically begin using simple, `meaningful words` and show understanding of simple commands. They are also taking major strides in physical development, such as starting to walk while holding onto furniture or someone's hand, and in cognitive development, showing signs of understanding object permanence. It's important to note that individual development can vary, but 12 months is a common milestone for meaningful speech development.