The search for a missing father and son is ongoing amid concerns over whether the baby has clothing and shelter to protect him from the severe weather.
Barry Lovell is slim, 5ft 10in (1.7m) tall, with short dark brown hair
Barry Lovell, 31, disappeared with 14-month-old Finley on Tuesday after a row with his fiancee over money.
Emma Bonner, 23, from Eastbourne, East Sussex, said Mr Lovell took no nappies or food, but has withdrawn cash.
On Thursday, Mr Lovell's parents appealed for him to make contact, 24 hours after an appeal by Miss Bonner.
His father Brian said: "Barry, please, please come home. We cannot sort it until you come home. We want the little man home too.
"We are rooting for you - Emma, your brother and sisters and the whole family."
Mr Lovell said his son was usually "level headed" and "very much a father".
"This is absolutely as out of character as it could possibly get. Obviously he's frightened and the longer it goes on the more frightened he's becoming," he said.
There have been three sightings of the missing man with baby Finley in Sussex and Kent.
The first was at the building society in St Leonards at about 1515 GMT on Tuesday.
Mr Lovell's silver Vauxhall Vectra was then spotted in Tunbridge Wells, Kent, on Wednesday afternoon.
The latest sighting was at about 2100 GMT on Wednesday, when he was seen in Bexhill Road, St Leonards, carrying Finley in a white baby grow.
Sussex Police said officers quickly searched the area, but there was no sign of Mr Lovell and his son.
Mr Lovell, an unemployed security guard, walked out of the family home in the Hampden Park area of Eastbourne, taking Finley and his five-year-old son Thomas with him.
He dropped Thomas off at Hellingly School, in Hailsham, East Sussex.