Hola Shirley

The sentence "Hablar no habla. Solo dice "mamá"." can be interpreted as 'Speaking doesn't speak. He/she just says "mom."' It's more like a playful or figurative expression suggesting that someone or something doesn't communicate complex ideas through speech but instead repeats simple phrases like 'mom.' So, it's not necessarily an instruction to avoid talking, but more about the limited or repetitive nature of the communication.

If you have further questions or if there's anything else I can help you with, feel free to ask.

¡Que tengas un buen día!

Silvia