A newborn with tongue out is not necessarily hypothyroid; hypothyroidism is usually determined by symptoms combined with a full set of thyroid functions. A newborn’s tongue may be related to physiological reasons, oral ulcers, trisomy 21 and other diseases. 1. Physiological reasons: due to the newborn’s own swallowing function is still not well developed, saliva may be secreted too much, if it can not be completely swallowed, at this time may be spit out through the action of the tongue to bring out the saliva, which leads to the newborn often spit out the tongue. 2. Mouth ulcers: if the newborn because the oral mucous membrane is broken, there may be mouth ulcers, but also lead to the baby’s loss of appetite, irritability, crying, spitting out the tongue and other symptoms. 3. Trisomy 21: one of the clinical manifestations of this disease becomes newborn babies spitting out their tongues, which can also be accompanied by special facial features, wide eye spacing, low nasal bridge and other manifestations. Chromosomal examination can be perfected to clarify the diagnosis. As you can see, you can’t judge hypothyroidism just by the symptom of newborn babies spitting out their tongues, and newborn babies are recommended to improve the screening of plantar blood, to be alert to the possibility of hypothyroidism, and improve the relevant examinations to make a clear diagnosis, and follow the doctor’s instructions to be targeted treatment.