I’ve noticed my little guy is starting to get frustrated with his toys as well. For him, I think it’s when he can’t pick them and bring them to his mouth. Pretty much his only goal with all of the toys. He’s happy as long as he’s having success.
My friend is a nanny and says they get mad when they don’t have the coordination yet to play with the toys the way they want to
my baby plays with them for a bit and then it gets too much for him, he gets overtired or overstimulated