my body was not made for running...but i had her in there without any additional support other than two rolled up receiving blankets at about 2.5 months. she had amazing neck control though, could pick her head up the day she was born. plus i never really run so i wasnt worried about her head bobbing all over the place.
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I didn't run w/ DD at all until after 6 mos. It's not so good for those little developing neck muscles to be bounced and jostled like that, and there's more to it than having good head control.
Ours lays completely flat and I put a Snuzzler in there. ?I can't remember when we started, but I want to say 2-3 months. ?I'm never really running, more like a slow jog, and am always on pretty smooth surfaces.
This isn't what you want to hear, but I waited until 6 months to stop using the carseat insert. I was worried about his neck. Ask your ped. though! I will also say that once I started running again I felt "normal" again so it'd be worth it to use it earlier if you can...
If i'm running i still like to use the car seat. she just seems so much more secure. plus, i like to look at her to make sure she's ok. if i'm walking i'll put her in without it. I've been walking with her without the car seat probably since around 5 months.
Re: If you use a jogging stroller...
I have the duallie but I'm not really a runner.
But, I honestly wouldn't feel comfortable running with him in it just yet.
~NDK~