It's very cute. Because of the angle, the left arm looks a mite bigger than the right, but if it were bigger, no one would ever know once the child has it on.
I think the general feeling around here is that anything made of wool needs to be blocked, acrylics don't.
Congratulations on a very sweet sweater!
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"All good things and every perfect gift is from above, coming down from the Father of Lights who cannot change."