I’m wondering if there is a certain amount of strength that a baby should be able to accomplish by 18-24 months of age.

This may sound like a very silly question... however, my 19 month old son can easily pick up one of my husbands 12lbs weights, with two hands and carry it across the room. My niece, whom is 20 months, can’t hold up a popsicle by herself. I’m wondering if one is normal and the other is not?

Has anyone else has experiences like this?