one of the first lessons for beginners is to hold the fiddle with chin and shoulder and walk around....hands to your side...the fingering hand (left) does not HOLD the fiddle up, it plays the notes, and most of the holding happens at the other end , by your neck, which is why it is important to concentrate on the comfort there.
this suzuki mom has heard many twinkles ! though my 4 & 5 year old fiddlers are now 20 and 25 and have gone on to other things...