I don't have children yet and therefore no experience with jogging strollers but I was able to find this..

http://www.buy-a-jogging-stroller.com/stroller-safety.html

Everything I heard was "When they can hold their heads up on their own".  It was the same answer for the jogger stroller, the back pack and the burley.

A lovely nebulas answer that I despised.  I generally went with 7-9 months....

No scientific basis, just when I felt comfortable with what I say.   

If it leans back a bit they'd probably be fine, assuming they have reasonable neck strength. I waited for 6 months anyway because I didn't want to get my wife mad at me.

My wife said I had to wait til his 4 month check up and the doctors ok but I snuck out a few days early. On our first run about 2.5 miles into it I stepped on the security strap and flipped the jogger over. My son freaked out and I think I sh@# myself. Everything was fine and the doc said as long as the head control is there they are fine.

Now almost 2 years later, and about 15 races under are belts I can honestly say enjoy it as we have. I love to race but racing with my little buddy is the best. We have a 10 miler next weekend and our still undefeated in the stroller division

Everything about jogging strollers that I have read (or used) says that babes should be 7 months or older---OR with good head/neck control.   

Thanks all.  Read this thread to my wife and she said there is no way I am doing it.

Their neck strength is decent, but not quite that well.  Here is an obligatory pic of the future racers.

Ask your pediatrician - mine gave me the OK based on my daughter's head control to start running with her at 3 months.  I did, and she did great

The stroller I have reclines a bit, and with the bigger tires, I actually thought she jiggled LESS in the jogger than she did when I took her for walks in her regular stroller!

Um, I'm a bit late on this one... but I wanted to put in my 2 cents.

I had a Baby Jogger II.  I'm not sure why the neck control is a big issue, since you can prop them any way you want to.  My son was an extreme preemie and I had him out in it before his due date.  Snugged him up like crazy and rolled blankets all around him and each side of his head/neck.  In fact, at that time he was still on a heart/lung monitor which I carried along in the pocket and it never ever sounded an alarm while he was in there.  Keep in mind, when he was in his infant car seat, it would go off on occassion.  So.. I guess you can say the jogger was more comfy for him and his physical therapists said the visual stimulation he got from being in there was a huge benefit. 

I got the infant sling for my chariot. Will use it walking pretty early, and running after a month or two.

Infant Sling

Give your baby added lateral support while providing maximum comfort and stability. The hammock-like design helps provide a smooth ride. Your baby is reclined and still able to look around and watch the world go by.

Not for use while cycling. From approximately 1-10 months of age.

We had the carseat adapter for our Bob stroller, which worked really well.  Unless you're doing a trail run, they should be fine in the carseat adapter.

Our daughter is 9 months now and does not like walking pace in the stroller, it has to be running or she gets a little fussy.  Running and chasing Mom is even better. 

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For stroller, I'd agree with the "when they can hold their head from flopping around".

For bike trailer, it is much older as they should be wearing a helmet, too.   Probably 18-24 months before they have the neck stregth to hold up a head and the added weight of a helmet. 

If it were me, I'd wait until next season until taking them to a race.  They won't remember anything or have any fun at 3.5 mos anyway. 

bboston88 - 2008-04-11 7:22 PM I used a carseat adapter with mine but not sure for how long, it's all a blur. Mine was preemie too so I'd say if your twins have pretty good head control you should be fine. Maybe put some towels rolled up to prop them up. But yes, they will survive.

I did a similar thing.  My daughter was born in April last year and I just went with concept that as long as she was in her original car seat I just put her in that in a rear facing postion (just like the car).  When she out-grew that I switched putting her in the regular position.  I liked the rear facing car seat setup becacause I could keep an eye on her. 

Do what you and your spouse are comfortable with.