Disclaimer:Naruto isn't mine
Being a dad means pricing out a Volvo or an SUV because side-impact safety protection suddenly matters to you.
Gaara liked sports car. It was his dirty little secret, no one pegged him as a Ferrari person but he loved them. Just because he was gay didn't mean he couldn't enjoy Kankuro's car and women magazines.
The pregnancy made him realize as nice as a Ferrari might be, it wasn't the best choice to carry a baby around. Ferrari as nice as they were, didn't have the side-impact protection. It was all too easy for another car to wreck it on the road. A Volvo or (And it killed Gaara to say this) SUV were better and more practical choices for driving the baby around.
A Volvo wasn't as bad as an SUV. Volvo could be stylish, once you got over how suburban they were, but an SUV will always make you look like a soccer parent. Always. Gaara didn't want to look like a soccer parent. What would the citizens of Suna think if they saw their Kazekage in a minivan? He would lose his respect!
The only thing left was to convince Neji to get a Volvo or wait until Ferrari makes a line of side safety cars.