I've just about finished raising my fourth batch of chicks. They ALL ate the pine shavings! But they sampled everything else that crossed their paths, too. My latest batch had a real thing for paper - toilet paper, kleenex, and paper towels. They were hilarious! They attacked any paper as if it were a fierce challenger, shredding it and eating it!
Yes, it worried me a lot at first. When they all seemed to suffer no ill effects from it, I relaxed.
That said, I have heard that once in a great while, a chick can get impacted crop from eating too many pine shavings. Treating impacted crop is something I've never done, and hope I never need to face. But it's a remote risk.
I've also heard of some people using sand as bedding in the brooder. It's an option if your chicks' hankering for wood shavings is something that you can't live with. But they'll eat the sand, too!
With one batch, I used peat moss. It was superior bedding in every way, except it was unacceptably dusty! As bedding goes, the chicks ate the least of it of any bedding I've used.