No other symptoms may be feeding discomfort, which can be improved by changing the way of breastfeeding, if combined with other discomforts, please seek medical advice promptly. Mixed feeding babies suddenly do not eat milk powder if there are no other symptoms, it may be caused by the feeding container, the brand of milk powder is not suitable, and so on, or it may be caused by feeding discomfort. This can be improved by adjusting the child’s feeding container as well as the brand of milk powder and changing the size of the nipple caliber. If breast milk is not enough to add formula, parents can try to adjust the baby’s feeding container and the brand of formula. For example, parents can use different brands of pacifiers, some of which are softer and easier for children to accept. But it should be noted that the caliber of the pacifier should not be too small, it should be larger. Of course, the caliber of the pacifier should not be too big as it can easily lead to choking of the baby. All these can cause discomfort in feeding children and lead to their refusal to consume formula milk. If the baby suddenly does not eat milk powder and has other uncomfortable symptoms, parents should take the baby to the pediatric department of the hospital in time and take effective treatment under the guidance of the doctor.