temperature sensor for baby incubator

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I cannot tell from this what the question is however you likely want to use a three terminal RTD configuration. If your volumes are not high you might also just want to buy a PID temp controller and hook it to an RTD sensor and drive the heating element with a solid state relay. Look at the watlow controllers for a good example. I have also used oven industries http://www.ovenind.com/
they make great OEM controllers - very cost effective. remember for medical there are extra safety requirements and of course FCC - UL testing so buying something ready to go could speed your time to market and reduce costs. Hope this helps