updated 06/14/2012 AT 10:00 AM ET
•originally published 06/14/2012 AT 11:15 AM ET
His grandfather thinks he has an idea.
“I sent my dad this pic and he said ‘luca told me to tell u, u made his oatmeal lumpy’ lol,” the actress, 24, Tweeted. “He is cute when he’s mad!”
And her adorable son (even when he’s crying) keeps the new mom happily occupied.
“I should be sleeping but instead I am watching luca break out of his swaddle on the video monitor,” she Tweeted on Wednesday night. “So funny…little guy is not giving up.”
Duff recently Tweeted, “Perfect Sunday on the couch with Luca and Mikey! Watched hang over 2 annnnnd couples retreat. Sooo funny I’m ready for bed lol.”