Cherral Mitchell, 31, needed two midwives to haul out big Alpha as he weighed a whopping 14lb 15oz – believed to be the third biggest newborn ever in the UK.
He’s since been nicknamed ‘Baby Hippo’ and ‘Butter Bean’ due to his colossal size.
And the big little one was also a surprise.
Alpha was born despite Cherral getting the contraceptive coil before he was conceived with electrical engineer husband Tyson, 35.
Cherral, who has three other kids, said: “We didn’t think he was going to be that big.
“Everyone kept laughing when his head came out. My husband Tyson was like ‘oh my God he’s chunky’.
“There were two nurses pulling – one was trying to push him down to get him out.
“The nurses said it had to be the biggest baby and were on their phones Googling.
“He’s a bit of a pumpkin baby with it being so close to Halloween.”
Alpha, who was born at 38 weeks on October 28, is believed to be the UK’s third-biggest baby.
The average weight of a baby born in the UK is 7lb 8oz for boys and 7lb 4oz for girls.
Doctors have put Alpha’s proportions down to a sweet tooth as they believe he was snacking on Cherral’s sugary fluids while in the womb.
Cherral, from Thame, Oxfordshire, said: “They think that because I was diagnosed quite late with gestational diabetes, Alpha was in amniotic fluid that was sweeter.
“So he was drinking a lot and peeing a lot and getting a high intake of sugar.”
Alpha was estimated to be 11lb 1oz in a scan at 37 weeks but he ballooned by three pounds before he was born a week later through a C-section at John Radcliffe Hospital in Oxford.
Stay-at-home mum Cherral said: “My stomach was big but not that massive so I don’t know where he was hiding.
“I keep saying I gave birth to a baby butter bean. My uncle Jason calls him a baby hippo.”
Cherral already has a son – Lyon, three – and daughters Rogue-Angel, four, and Twyla Bay, 10 months – but said that Alpha is the biggest by a long shot.