Besides trying different brands, will also need to find the teat with a flow that your baby likes.. the teat may be too slow or too fast. If too slow, baby will get frustrated and reject. If too fast, baby will choke and cough and also reject. If the teat touches baby’s mouth only and the baby turns away, can try warming up the teat first before to mimic body temperature. Most importantly, don’t give up keep trying, baby will accept one day!