“…However, animal models and human studies, have suggested that the LES muscle is not weaker than in the adult, nonetheless, there is an inadequate relaxation of this muscle, since its maturing will only happen at around 3 months of age, when the LES which was intra-thoracic, starts having an intra-abdominal portion 3 . It is very common, especially in children, besides the classic pyrosis, seeing manifestations in the upper and lower airways [4][5][6][7][8][9] . Among them, we can mention recurrent tonsillitis, recurrent pharyngotonsillitis, asthma, recurrent otitis media, and others [5][6][7] .…”