Grade 3 adenoid hypertrophy. Year!

My son had severe teeth biting during night which let us analyse his adenoids. We have tried sprays and medication for almost 8 months and still there is no shrinkage. He has maxillary expansion which has reduced his teeth biting issue to a large extent. His ENT has suggested surgery to remove adenoid and tonsils but his paediatrician says strictly not to do a surgery, in his opinion they will shrink in a few years . Enlargement has been in grade 3 for past one year . He doesn't have any sleeping issues and has rare cases of cold/ fever. May be 2-3 times a year. Slight teeth biting and sometimes breathing through mouth during nights are the symptoms now. Not under any medication at present. He weighs 14.5kgs and 104cms high which we think may be low for his age , his birth weight was 2.3kgs . No issues with eating Can we wait for few more months or the surgery is necessary Attaching X-rays taken this year and the before year