M.B.
congratulations on all your babies!!! I have three and had a very different breastfeeding experience with each. from your story it sounds like looking at the clock was better for weight gain. but actually, what you did with the last 2 may have been.
you mentioned researching your technique. how updated was it and what were the sources? I work i a baby friendly hospital. we teach our moms to look at the baby. if you ever get your hands on the book breastfeeding made simple, read the foreward by dr. jack newman. it has a very good explanation how we evolved to looking at clocks instead of reading our babies. by the way, the dvd the happiest baby on the block is pretty amazing too.
so how do you read the baby?
hunger cues:
1. lip smacking
2. mouthing (sticking her tongue out)
3. turning head to side and opening mouth
4. bringing hands to mouth
5. in a sleeping baby, rapid eye movement
signs to fullness:
1. no longer showing any of about signs when stimulated
2. asleep with hands open and arms relaxed not flexed
3. weight gain
4. adequate wet and dirty diapers
a couple reasons why you don't want to only feed for 15-20 min is because the creamier milk (or hindmilk) may not have reached the baby in that time frame. You also may not be emptying the breast as much which will leave your body making less milk for baby.
keep in mind that some babies are fast eaters and some a slower eaters. it's hard to tell if that's the reason when you only have one that you're feeding. I've talked to mom's of twins that had a fast and a slow feeder. obviously they were getting milk from the same place, so you could see that it was the difference in the child.
My personal experience:
with all of them i emptied one side before offering the other.
With my first I would generally let her her feed as long as she wanted. I would make sure that it was at least 20 min. But if she stopped showing (what I thought)interest after 20 min. I would take her off. I also waited until she started crying to feed her (about every 4 hours). that makes learning for her more difficult.
With my 2nd, i had more information on breastfeeding and looked back and thought maybe my 1st was fussy at times because she was hungry. so i fed her whenever i thought she was hungry--looking more for hunger cues and not waiting for crying. she's my petite kid then and now. i was reassured by her doctor that her slow weight gain was fine, she seemed healthy every other way.
I fed my 3rd much more like the second. for some reason she swallowed more air and I'd have to burp her in order to finish a feeding. she is definitely my biggest kid. i weaned her at 11 months. when she was 13 months i took a class on lactation. i wished i had breastfed her longer, and even half seriously joked about relactating.
I'm pregnant with my 4th and plan to do lots and lots of skin to skin, watch for signs of hunger and fullness, and use the methods of attachment parenting. personally, i think that attachment parenting is one of the easiest ways to parent ESPECIALLY when you have other little ones to care for.
i'd like to hear from you. just on your thoughts and how things are going. good luck with everything, and again, congratulations.