Stuck in a rut

liap

Hi! I have been logging calories with mfp for ages but never utilised the forums or anything. I lost 20 kilos initially but have just given birth to my second child 9 weeks ago. I have been unable to loose any weight for the past 6 weeks and I still have a good 6 kg to loose ( not to mention the body changes yuck) prior to this I was a slim 62 at 171cm tall, this was after a lot of hard work. I fear I'm not eating enough calories (except today's Australia Day blowout!). Could this be why my weight loss has stalled? I'm struggling getting my head around eating more without feeling down on myself but what I'm doing now isn't working!
Thanks