Is it true that breastfeeding helps to loose weight easier after delivery? Must LO latch to consider or pumping breastmilk out is also the same?

Yes and no, breastfeeding could help a nursing mother lose weight because the nursing mother's body would use a significant amount of energy to produce the milk needed. However, this also makes a mother hungry so that she would consume more to have enough to meet the energy requirement. Most of my friends keep to a healthy and balanced diet while breastfeeding and were able to lose some weight. Oh, it doesn't matter if baby is latching or not as the energy is used to produce the milk. So pumping will have the same effect as well. Here's an article with some useful tips on how to lose weight while breastfeeding: http://www.thebump.com/a/lose-weight-breastfeeding

It will certainly help but I know a mother who could not breastfeed at all (she was on medication) and her baby is fully formula fed. She lost weight really fast. Reckon it either had to do with the medication she took or the fact that she was very active. She's generally a gym freak so she was working out and going on her low carb, high protein diet as soon as the doctor gave her the green light.