my 4 mos old girl start STTN at 2 mos. i had a very bad issue before, she was a good sleeper from birth til 2 weeks. i changed her diaper without waking, she just suck her hands but no cry when she's hungry. but when we transfer to another apartment when she was 2 weeks old, her sleep pattern was chnaged. at first we thought she just find strange to the new environment but we were absolutely wrong. she wanted us to play with her at night, cried aloud when we close the lights. she wanted to nurse often though she's full until she vomits.there are even times when she doesn't want to stay at our room, she want in the kitchen. at age 2 months i search it on internet, even post here and one mom told me to establish a night pattern. i did try it- night bath, i read book for her( she likes it when i read Bible aloud), nurse and pacifier instead of nursing often and end up vomitting. it was not so easy, she still wakes up when i put her to bed though we co-sleep.until i discover that holding her on my arms and we sleep both is comfortable for her. that's how i establish a night pattern,at 3 mos she STTN 5 hrs stretch sucks her hands when hungry but eyes are close which is a sign for me to nurse her and we fall back to sleep i just let her latch as long as she wants.