Hi Mommy, my baby is 5 months old and he just started using the no. 2 teats of Avent. When he was 3 months old I also tried to use the no. 2 teat but he choked! So don't worry too much if she is still using no. 1 teat. my sister-in-law's 9-month daughter is still using no. 1 teat. I guess it really depends on the baby. Try the no. 2 again once he reaches 5 or 6 months :)
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