This is actually a very good question. Babies will extend their heads and necks like this if they have difficulty with breathing. This is particularly when the cause of the difficulty in breathing lies in the upper airway such as with a blocked nose, enlarged adenoids or enlarged tonsils. Also with a condition called laryngomalacia where there is a temporary softening of the cartilage of the larynx [voice-box] and/or the trachea [windpipe] As he still continues to prefer to extend his head it would be best to have him seen by a paediatrician.This may just be a habit but it is sufficiently regular and persistent to need checking.
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