Katie Price: Prader-Willi syndrome makes Harvey so hungry all the time he tries to eat frozen pizzas
But the mum-of-three adores her eldest child and wouldn't change him for anything.
'Every day with Harvey starts like the alarm clock,' says Katie, 34.
'You know when he's awake because he bashes around his room.
'We have to do certain knocks [on the door] to give him his breakfast.
'He has two bits of toast with honey and they have to be in triangles.
'When you're hungry you get angry if you can't eat - that's what he's like all the time.
'Everyone thinks it's his weight or eyesight, but all he wants to do is eat.
'That's why his weight goes up and down.
'He's on medication and will be for life. If he didn't take it he'd die.'
Katie's son is crafty, too.
'He gets into the cupboard and hides, thinking we can't see him eat the sweets.
'We have to lock the freezer, too.
'He got into it and tried to eat frozen pizzas.'
Read the full story about Katie Price and Harvey in Now magazine dated 25 June 2012 - out now!