Emotional blackmail on LeStrange. Also -- half a year is too long a time period. by far.

Figure without time turners but with healing magics and potions an eight month birth. Rip the kid out of her womb, and heal her back into active duty. You lose her services for maybe a month. (Up to six months in and she's still combat-capable.)

Heal both kid and mother, and there you go. (also, if we can assume accelerated gestation potions then we get even more silly. No "downtime" at all No need for time turners.)