"Medical Interns earn the 'Give medical advice' social, which helps out pregnant Sims. Pregnant Sims who regularly seek medical advice (or receive it) assist the development of the pregnancy, which can lead to the baby getting highly desirable traits."
"TIP: If the Medical Intern is the one who is pregnant, the 'Give Medical Advice' are automatic."
"At the Resident level, Sims get two new socials. Give Good Medical Advice and Brag About Being a Doctor. The 'Give Good Medical Advice' has a greater benefit to pregnant Sims--in fact the medical Sim can even deduce the sex of the baby." The Brag social impresses other Sims in conversation."
"The Neurosurgeon promotion turns Give Good Medical Advice to Give Amazing Medical Advice, which is even more beneficial to expectant mothers."
This is from the official game guide. It doesn't say, however, what benefits the Neurosurgeon can give to pregnant Sims.
"At the Resident level, Sims get two new socials. Give Good Medical Advice and Brag About Being A Doctor. The Give Good Medical Advice has a greater benefit to expectant mothers-in fact, the medical Sim can even deduce the sex of the baby."
"If the medical Sim is the one who is pregnant, the Give Medical Advice benefits are automatic."