I can't really say it's the breastfeeding making me tired , my first pregnancy I was so so tired all the time, but not so much my second pregnancy and I was still breastfeeding the first, and this time I'm still breastfeeding number 2 while pregnant with number 3, but the nipple pain when he latches on is so painful sometimes! I remember this from last time, it calmed down in the 2nd trimester, I am going to have to try and wean this child! He has a cold right now so wants to feed all the time, ouch!