Honey Rose, 35, a mother-of-three, had performed a routine eye test on Vincent Barker in February 2012 but failed to spot a life-threatening condition, resulting in his death five months later.
He had denied charges of gross negligence amounting to manslaughter but was found guilty after a trial at Ipswich Crown Court here.
The prosecution claimed her conduct had been so far below the expected standard it was "criminal".
A suspended jail term in the UK refers to a deferred custodial sentence on strict conditions.
The judge told her, "You simply departed from your normal practice in a way that was completely untypical for you, a one-off, for no good reason".
Detective Superintendent Tonya Antonis of Suffolk Police, said the sentence was "proportionate in the circumstances".
"It was never the Barker family's intention that Honey Rose should go to prison," she said.
"The knowledge our loss should have been prevented and Vinnie should have been saved is intolerable to live with," Barker said in a statement.
The jury was told there were "obvious abnormalities" in both of Vinnie's eyes visible during the examination.
A build-up of fluid on the brain increased pressure in Vinnie's skull and ultimately led to his death.
Rose had claimed her examination of Vinnie was tricky because he had closed his eyes to the light and looked away during the test.
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