While we do not make a stethoscope specifically for pediatrics or NICU patients, Thinklabs One is used by many pediatricians, even some who work in NICUs.
The dimensions of the stethoscope are as follows: The diaphragm (the part that touches the skin) is 46mm across and the stethoscope probe is 28mm high.
If you are a pediatrician and would like to try Thinklabs One, remember our stethoscope comes with a 30-day money-back guarantee. If it doesn't work for you, you can return it to us for a full refund.