This is quite common when there is a need to marry early or the marriage had some controversy, my great grandfather married at farnworth near widnes and his bride lied about her age and his brotyher had dfone the same 5 years earlier, they were from Stockton Heath and sons of a gentleman farmer but did not marry with the parental consent., for some reason the vicar at farnworth allowed them to marry, i know that there were fees payable so to speak.
just because there was a child born a year later does not preclude an earlier pregnancy that did not go fulkl term, hence a need to be off marrying outside the parish in a hurry.
manchester cathedral in the early 1800s used to perform a hundred marriages a day for anyone that could travel and pay the fee. check that out, it was scandalous!!!!