My 4 and a half month old baby sometimes makes a high-pitched noise when she breathes in. Should I be worried?

If your 4 and a half month old baby is making a high-pitched noise when inhaling but doesn't have a fever, cough, or runny nose, you may not need to worry at this point. It's a good idea to discuss this with your baby's doctor during the next check-up to get their professional advice.