We use MAM never had issues, moved onto a bottle during daytime at 4.5 months and fully at 6 months. I would start with slow flow teat.
Switched to mam bottles after breastfeeding at about 5 months, moved slowly through teat sizes and now we are on size 3, no issues
wait no sorry mum brain kicking in 🤣🤣 i meant tommee yippee 🤣🤣🤣