pacifiers?

Victoria • 22. Viviana’s Mama.

Might be a silly question, but how often do you switch our paci's for your LO's? We use MAM pacifiers and since Viviana turned 5 months we thought we might as well buy 6+ pacifiers to have on hand. My SO wants to start using them now, but I want to wait until she turns 6 months like instructed. So they have sizes for orthodontic reasons? Or for comfort?