I personally believe this car isn't made to be a "famiy car". You really can't beat the practicality of a four door sedan. Here's why
1) the BRZ/FR-S is a pretty low car (stock) which will make it really hard for a pregnant women to get in and out of.
2) the back seat is useless (in my opinion)
3) you're just going to want to go sideways in this thing all the time
In all means this is a super fun car to drive.
Hopefully this helps a little in your car purchase