isn’t the jogging prams jkust the 3 wheeler, i had one of these for both my kids from birth but i never went jogging with it … for normal use i had a bassinet insert for the first couple of months, but for actual jogging or running with it i would just gauge that to your comfort with the guide of babys head, can he/she hold it up or stop it from falling if you knock a little bump or go down a hill etc and the straps are tight – the straps on one of my prams didnt fit snuggly until bub was about 6-7 months. I think you may also be able to buy an insert for protecting their necks if you worry about . Above all else your the mum and you will know what is right/safe for your baby.