Drinking milk before bedtime for 3 year old babies is likely to cause dental caries, nocturnal enuresis, reduce appetite and cause digestive system dysfunction. For 3-year-old babies, drinking milk before bedtime is a bad habit that may bring the following adverse effects. 1. Tooth caries: drinking milk before bedtime can easily cause caries in baby’s milk teeth, because drinking milk before bedtime, teeth are easily damaged if not properly cleaned. It is best not to drink milk within 2 hours before bedtime. 2. urine loss: 3-year-old baby’s bladder and nerve function is not fully developed, drinking a lot of water before bedtime may lead to nighttime urine loss, drinking milk is the same. 3. Reduce appetite and digestive disorders: drinking milk before bedtime when the baby more than no hunger, easy to cause decreased appetite and digestive disorders. Parents are advised to adjust the 3-year-old baby’s bad habit of drinking milk before bedtime to avoid the occurrence of the above situation.