Final answer:
The nurse should respond that it's common for gestational diabetes to result in larger babies.
Step-by-step explanation:
The best response by the nurse in this situation would be option B: It's common for gestational diabetes to result in larger babies. Gestational diabetes is a condition where a pregnant woman has high blood sugar levels, which can lead to the baby growing larger than average. This is because the excess glucose in the mother's blood is transferred to the baby, causing it to grow at an accelerated rate. Therefore, it is not uncommon for babies born to mothers with gestational diabetes to be larger, even if they are delivered early.