Yes and no...... On one side yes if they STAY small they will have less pelvic area. But on the flip side they themselves carry half of the genetics that will control how big their calves will be...... We just calves a cow last night that I had bought at the sale barn last spring before calving. Last year I had planned on just getting the calf and selling them both, but two things happened..... She had a 52 pound heifer calf that weaned as big or bigger then any of our other calves. I also tracked down the guy that had sold her, through the sale barn, turned out it was a friend of my dads.... She is a Bismark daughter, they sold her only because he likes 1600 pound cows and she was only about 1200 as a second calver....... We AIed her back to a bull that typically throws calves in the mid eighties........ She calves lt night, had about a sixty pound heifer calf, though we haven't got her on the scales yet. Best 1135 dollars I have spent.
The problem with club calf breeding on heifers is that growth is not always thought of when picking bulls. "She is big enough to balance him out". Goes through the minds of a lot of people, and unfortunately you are just as likely to get daddy's frame and mommies muscle as the other way around....... Then when it comes time to keep heifers back you look and go, "she is outta (insert popular clubbie bull her) so she could maybe through some bigtime show calves". I have made that mistake before as well...... I think I am getting past it though, we just sent two heifers to the sale barn that we kept waiting on to look like what they came out of...... But picking purebred bulls with EPDs you can look for the low birthweight high growth bulls to get the calving ease and still have heifers with 6+ frame scores.
So yeah, low birthweight with no growth leads to trouble because of no frame size, not her low birthweight, But I would also say selecting based on single traits is NEVER a good thing......