Immigration officials are investigating reports that a 20-day-old baby was smuggled into Britain in the back of a lorry.
The girl was among a group discovered at Watford Gap services on the M1, The Sun reported.
The newspaper said they had made the journey from Calais.
A Home Office spokesman said: "This incident is of concern and is under investigation.
"Would-be migrants need to be aware that they are putting their lives, and those of their loved ones, at risk by attempting to reach the UK illegally.
"That is why we have increased security and boosted technology used at border controls and are working with law enforcement at home and abroad to target the criminal gangs who are often behind such attempts."
The Home Office confirmed Northamptonshire Police alerted Immigration Enforcement to the discovery of 10 migrants in a vehicle at Watford Gap services on Tuesday.
It said nine presented themselves as being from Iraq and a 10th from Iran, adding that all of those on board the vehicle were being interviewed by immigration officers.