Robert Downey Jr says it has been 'exhausting' and 'terrifying' since his young son has learnt to walk and climb.
Downey Jr became a father for the second time when his wife Susan Downey gave birth to their first child at the beginning of 2012.
Now Exton is up and about and is exploring, keeping his father on his toes.
Speaking to Access Hollywood, Downey Jr said: "Yeah, he just wants to sling open drawers and grab knives.
"It's really not stressful at all! When he first started walking, it was kind of like, alright, this is a little bit exhausting and terrifying, and then he kind of smoothed out and now he can climb things."
The actor revealed that he had an accident as a child, and does not want to see his son suffer the same thing.
"I just remember when I was 2 or 3 or 4 years old, I found my way to the top of the refrigerator and I hung out there, that was like my spot until I lost my footing and banged my head on the radiator.
"I remember some doctors squeezing my head... I don't want him to fall off the refrigerator."
Downey Jr and his wife are set to welcome their second child later this year. The actor went on to reveal that the couple were expecting their first daughter.
Downey Jr met his producer wife Susan on the set of Gothika, and went on the marry back in 2005.
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