From the AP:
Dana Hoekstra said her suspicion that Liam was physically different quickly intensified. Two days after he was born, Liam could stand up and support his weight if someone held his hands to provide balance, she said.
His heart and kidneys healed within a few months, but it took 18 months before he stopped throwing up daily.
Liam's muscular thighs at 5 months of age gave him the appearance of a miniature Lance Armstrong. By 8 months, Liam was doing pull-ups and, a month later, climbing up and down stairs, his mother said.
What really amazed his parents was the way Liam fell.
"When he fell backward, he would land on his butt, but he never hit his head on the ground," Dana Hoekstra said. "His stomach would tense up and he would catch himself before his head hit the ground. You could see his stomach muscles. He had a little six-pack."