What I'm going to say is that first of all the stethoscope that you have is going to be perfectly adequate for what you need. However, it is possibly not going to be the best stethoscope for the job. Personally I use a Cardiology III stethoscope and it's major claim to fame is that the stethoscope had rotates from pediatric to adult. My understanding is that they no longer make the Cardiology III stethoscope anymore but you can find it on the Internet still. They replaced it with the Cardiology IV stethoscope which offers the same basic functionality. As far as using a cardiology stethoscope versus a "standard" stethoscope, I would suggest that unless your ears are very well accustomed to listening to a stethoscope, you might not be able to greatly appreciate the difference in fidelity between the stethoscope varieties.
I have used $12 disposable stethoscopes, the Littman lightweight, the classic II SE, in addition to the cardiology stethoscope I have. In particular, I have used all of these in nearly every typical environment, from the roadside to the bedside. I can certainly tell the difference in the fidelity of all of those,, and I can use all of those in place of another but if I need to have the highest fidelity possible, I'm typically going to go for my cardiology stethoscope first.
I am not going tell you not to get a Cardiology IV stethoscope, they are awesome. What I am going to say is that the Cardiology stethoscopes will do very well for what you want, and they do have a pediatric side and an adult side and the performance from either will be quite good. It is up to you to decide if you're willing to spend as much as the Cardiology IV is listed for, but if you can find a Cardiology III stethoscope, you will get comparable performance for about half the price.