A new kit for testing paternity will go on sale in high street store Boots.
The Assuredna test, which is already available in more than 350 independent pharmacies, gives results in one to five days.
Manufacturer Anglia DNA has laboratories accredited by the Ministry of Justice to carry out tests for courts in England and Wales.
Mandy Hartley, technical manager at Anglia DNA, said: “Every paternity issue is different but, for the majority of cases, families receive the results they were expecting.
“Assuredna provides families with peace of mind so they can move on with their lives.
“Around half of all tests we conduct are related to children under 12 months, helping confirm paternity before the child has matured and is fully aware.”
For the test, samples of cells are collected from the mouth of the father, child and mother.
These cotton swabs are then placed in colour-coded envelopes and posted to Anglia DNA for analysis.
Both mother and father must sign forms giving their consent for the test and include proof of identity.
The test is available to anyone aged 16 or over and costs £29.99 to buy, plus a £129 lab fee.