LO not drinking much

Hi mummies My LO is 2m11days old. Since yesterday, she hasn’t been drinking to her normal capacity (100ml), she stops at 60-80ml. She’ll crave for milk more frequently also. She’s currently using Pigeon SoftTouch 1mth + teat and I also note that she is fussier when drinking. Could it be due to the teat that’s causing her to drink lesser? Should I try to transit to 3mth + teat already..? Let me know, thank you. :)