Changing soothie?!

Cassie • 27 ♊️ | MMC Jan 2018 👼🏼 | mama to Nathan 06.06.2019 🌈 | mama to Hailey 10.10.2021 💕

FTM...My baby is currently using a 0+ soothie, he’s gonna be 3 months on sept.6 so I was wondering when can I make the switch to the 3+ soothie?! I’m using the Phillips Avent soothies in case that matters ...