I watched all those STTN threads popping up 2-3 months ago with envy, thinking, "Why can't that be me?" As recently as a month ago I was still getting up 3, 4, or 5 times a night and wondered if my LO was going to STTN before, say, college. We started some (very gentle) sleep training a few weeks ago and that, along with a few more weeks of maturity under his belt (LO is now four and a half months old), finally did the trick. He went down at 7:20 last night and did not wake up until 6:05 this morning!! I had to get up and pump at 3:40, but I still got nearly 6 hours of consecutive sleep!!
Just wanted to post this for everyone out there still suffering with multiple wakeups every night...if my kid can STTN, yours undoubtedly can too.

Over-40 parents...what we lack in vigor, we make up for with cunning.
Re: STTN, at long last!
"I won't give up on us, even if the skies get rough, I'm giving you all my love, I"m still looking up."
TTC #1 since August 2011 MFI Diagnosis - April 2012
IVF #1 - July 2012 - Stims start 7/2, ER 7/12, 20 retrieved, 16 mature, 13 fertilized!
ET - 7/17 - 1 blast transferred. Beta - 7/26 273, Beta 2 7/30 - 1143. Beta 3 8/6 - 11,597
12/25 - Santa tells us "IT'S A GIRL!" EDD - April 4th
Our Little Easter Bunny has arrived!
Molly Mildred born 03/31/13
TTC A Sibling....... FET #1 11/14/14, Transferred one beautiful blast
Remaining four frosties arrested due to "embryologist error"
Plllllleasssee stick little icicle.....Beta 11/23...BFN
Starting ALL over with a fresh IVF cycle
Stims start 11/28/14, ER December 10th, 13 eggs retrieved, 11 mature, only 4 fertilized
1 Blast Transferred on December 15th..... Beta Christmas Eve... Please Santa, bring me a baby!
Beta #1 345.....Beta #2....750/ First U/S 1/13/15/HB 131....EDD 9/2/2015
The bedtime routine is the same, but it has two extra things tacked on the front end: a walk up and down the street for 10-15 minutes and two readings of The Going To Bed Book by Sandra Boynton. The check and console routine is the same (and my husband always does it if possible), but the most important thing about nighttime is that we started encouraging LO to space his feedings a bit. (LO is EBF.) I also started sleeping in another room. We started with a gap of 3.5 hours from the start of his last pre-bed feeding to when I would feed again. (Note: When we started this he was 15 pounds and clearly healthy.) If he cried before the 3.5 hours was up, my DH would go in and console him. If DH had to go in a second time, he would do a diaper change just to ensure LO was comfortable. Things started improving within 3 days. After about two weeks, we bumped the feed spacing up to 4 hours (start to start). If he was only 5 or 10 minutes "early" I would still go in, but more than 15 and I would let DH console him instead. We also had a rule that we were not getting up for the day before 6 AM. After another week or so, this resulted in a very tolerable 12-hour routine for LO: he'd go to bed at 6:30 or so, I'd feed around 10:30, go to bed myself, get up at 2:30 or so (and DH would automatically do a diaper change here), and then start the day with a feeding around 6:30.
I knew we were really getting somewhere last Sunday: I put him down at 6 PM (he was clearly tired), he woke up at 11:55 PM for a change and feed, and then he slept through until 6 AM! Wow! This was followed by several not very good days and then a return to the 4-hour-ish schedule. Yesterday was a very busy day, and he had three naps, the last of which was a 20-minute catnap at 5 PM. He was out cold at 7:20 PM when I put him down, which usually results in more wakeups, but voila! He finally slept through. It only took us, oh, about five weeks from when we really started working toward it, but everyone is so much happier now, including LO. He is much smilier in general, and is actually less likely to fuss and cry if I put him down awake then if he is mostly asleep.
I think I covered it all but if anything doesn't make sense, feel me to PM me.
Over-40 parents...what we lack in vigor, we make up for with cunning.