Five children wrapped up against the bitter cold – including a baby without socks or shoes – were among the migrants who landed on the Kent coast on Monday morning.
Arrivals in Dover amid near-freezing conditions after making the perilous journey across the English Channel included a family of four.
It comes despite a recent £28 million agreement between the UK and France to double police patrols on French beaches.
Several dozen people are believed to have successfully travelled to Britain on Monday.
Five children were seen being brought into the Port of Dover aboard a single Border Force rib, along with a number of adults.
They are believed to have been picked up in the Channel by Border Force cutter Vigilant after departing from France.
The youngsters, some too young to walk, were visibly suffering from the 1C temperatures at the Kent port and were wrapped in blankets and life jackets.
Among them was a baby who did not have shoes or socks, being carried ashore in the arms of a woman
Despite continued vows by Home Secretary Priti Patel to make the route “unviable”, there have been unprecedented numbers crossing the Channel in small boats in 2020.
Last month, Ms Patel hailed a new agreement with her French counterpart aimed at curbing the number of migrants reaching the UK in small boats.
But the £28 million deal has not stopped people making it to UK shores, as Monday’s arrivals appear to show.