3-month-old infants who always bite their lower lip are considered to be in the micturition period, which can be improved by soothing pacifiers and diverting attention.
3-month-old babies are in the micturition period, and always like to use their mouths to soothe their restlessness, anxiety or boredom, so there will be frequent sucking movements, including always biting the lower lip.
At this time, parents do not need to worry too much, you can buy a pacifier to divert the attention of the child, or usually more tease the child, play with the child, so that the baby’s attention is not always focused on biting the lower lip, the situation will slowly improve.
There may be other reasons why a 3-month-old baby bites his or her lower lip, so it is advisable to see a pediatrician for professional advice.