[mottati]

His windows are tinted already, as mentioned in the original post!

My wifes 525iTa had the sun blinds, and my kids were always breaking them, more of a liability with small children.

FWIW, it won't be long until the baby is facing forward... in the mean time, you could get one of those cheesey suction cup blinds to stick in the window (but my wife was alway afraid it'd fall on the baby!) or start training to wear sunglasses!
Mike

 

[mottati]

I did exactly that yesterday with 2 of them mounted on the rear window which seems to have done the trick. Not exactly the most elegant solution but it works for now.

they grow extremely quickly, it won't be there for long.
Mike

 

[mottati]

One other thing, there used to be a manual sunshade available as a retrofit. Still need to disassemble the rear deck (not that difficult) but no wiring involved. Might want to do a search over on the regular e39 board on roadfly.com or bimmerfest.com. A guy named Tyrone was the retrofit guru for all things e39. I had thought about doing this for my 528 (same reasons as you, several years ago) and the cost was still near $1k.
Mike