Kim, eto kasi reasons why umiiyak ang baby while nursing based on my experience:
1. naiinitan - remedy: paypayan ang baby, loosen his clothing, mag-a/c, electric fan
2. mali ang position - remedy: i-correct kaya kailangan alam ng mommy kung ano ang correct position
3. mali ang latch kaya walang nakukuhang milk (hindi dahil WALANG milk per se) - remedy: i-correct ang latch, try and try until you get it, research din, marami sa you tube niyan
4. tense ang mommy - remedy: mommy has to be relaxed so baby can relax too, mommy has to correct her position, play mood music, dim the lights, mag a/c, etc. in short, kailangan comfortable ang mommy
Dito Nesz kailangan talaga happy ka. Sa totoo lang, hindi ako nag-post partum depression because of BF. I read somewhere that breastfeeding also releases the happy hormones kaya breastfeeding moms are less likely to suffer from PPD.
5. hindi naman talaga ang milk ang kulang, baka nababagot si baby, in which case, kantahan, ihele, etc.
6. Do not wait until baby cries before giving your breast. Kapag nasa crying stage na, gutom na gutom na si baby niyan. Look for other hunger cues like salivating, moving the lips, being quite fussy, etc.
Anyway, sa next pregnancy mo, I can guide you on how to be successful at it. It's not easy but if you know enough, you will not easily get discouraged.

Momai, if you have a question re BF, ask me lang or PM.

Mas maigi kasi talagang paghandaan iyan, physically by eating the right food, emotionally by being decided talaga (hindi half-hearted or dahil lang maganda kasi or uso or there are a lot of hip moms and celebs doing it) and mentally (kasi you have to distinguish between fact and myth).