Dr Robert Wilson said the shocking figures revealed in last week's Standard, showing Boston to have the highest infant mortality rate in the whole of England, have already been investigated by his public health department in Lincoln.
Dr Wilson, a consultant with Lincolnshire Primary Care Trust, told The Standard he had concluded it was 'most likely' there had been a 'blip' during the three years when the government study was carried out.
He said: "Twenty-one deaths during the three-year period 2002-2004 is clearly high for the Boston borough area. We obviously looked into that.
"The rate for those particular three years is much the highest for a long time, and well above the long-term average.
"We think that's just a chance proportion – but we can't say that's absolutely the case."
He pointed out newly-released figures show only three babies had died in Boston borough during 2005.
"Obviously we don't know for certain whether there was a blip in 2002-04, or whether it's a long-term trend – we won't know for another couple of years," he said.
"We look at these figures over a three-year period, as the number of deaths is very small and can fluctuate."
Dr Wilson said his team had investigated each infant death in Boston between 2002 and 2004, and was satisfied there was little doctors could have done.
He said: "We had a look at all 21 deaths, looking at death certificates and so on.
"We don't think there were any that could have been prevented by medical care."
He said most of the babies were born very prematurely, or with abnormalities that are impossible to treat.
Dr Wilson did say, however, that there is a link between deprivation and infant mortality rates, and suggested the regeneration of Boston could have a positive impact.
He also highlighted smoking as a possible factor, as pregnant mothers who smoke are far more likely to have their baby prematurely, while the risk of cot death is doubled if somebody in the house smokes.