This is the first time we are trying a booster. J is 42ish punds, in a Harmony Dreamtime booster, in the third row of a 2005 Town and Country. In the first pic, the headrest is on the lowest setting. In the second pic, it is moved up one notch. I am not sure about the fit by his neck....but since I am new to boosters not sure if this is ok or not.