That's what I wonder too, yesterday night here in my computer it appeared with white spaces and couldn't post anything in the web so when I decided to change it from sticky to normal something has been wrong (don't ask me what did I do)
I have only 2 books of Tracy, one for young babies and the other one (haven't readen it yet) for babies older than 8 mos I think, does she have another one??
And I read PU/PD is not suitable for younger than 6 mos here in the site, in PU/PD forum there is an announcement (fifth I think) named: The dirty dozen: 12 reasons PU/PD won't work, and the first one is that is not recommended for under 6 mo. cause it overstimulates them (have a look at it and please tell me if you agree with the post)
And by the way: I don't agree at all with Ferber, couldn't do it.
Yesterday I tried to increase awake time and wasn't so bad, sometimes he could stay for 2h and at the end of the day he didn't sleep from 4:30 pm until 7:30 pm (we went out for a quiet walk hopping he would fall asleep, as he always do it, but he didn't and he was really calmed during on it), finally he took a short nap from that time to 8 pm, and then didn't fall asleep til 10 pm (he's usually bed time is 9, but I'm sure he didn't got asleep until 10 because of the late nap), but i think this change has affected his sleeping time during the night, tonight has been really well, he only woke at 4 am, but didn't feed him, gave him paci and kept on sleeping, and at 6 woke for his feeding, gave him, back to sleep until 9 am (he's usual wake up time), feed at 9:30 and now at 10:45 he has got asleep, 1h:45 min. after his waking time.
Thanks for the advice and will keep on doing it during all this week to see how does it goes, hope a travel we have to do on friday, 600 kms away to my sister in law wedding doesn't affect him :!: