my ds is 18 weeks and rarely manages 2 hours (usually 1.5hrs) of wakefulness before needing his next nap. He seems to average 3 naps per day two of which are in excess of 90 mins and the last one usually shorter and then he seems to be able to go longer until bath/bedtime. I am delighted at this development as up until around 1 week ago he could only nap in 30 minute increments but I am really curious as to what your lo's are doing because this doesn't seem long to be able to stay awake. Your views please.....