Re: It's understandable to be a little concerned...
Also keep in mind that any change to non-sport shocks might result in more jiggly up-down motion as the non-sport shocks have less damping. You might end up with a more bouncy ride. The X3 does not have a mellow ride (even compared to the M5) but in no form does it reach the level of shaken baby syndrome . . . Our 9 month old does fine; congrats on the upcoming new addition and on the X3.
'04 Jet Black 3.0 6-speed, PP,terracotta, xenons, premium sound, PDC, heated seats, privacy glass, sat prep., Dinan strut tower brace, Y-Spoke, Goodyear Eagle F1 - 235/50/18 F, 255/45/18 R (Dunlop Wintersport M3s for winter).
'02 M5, Bluewater/caramel, Dinan Exhaust