I have a 4 week old who I am struggling to breastfeed. I breastfed her for 2.5 weeks at which point she was not only still losing weight but the rate of weight loss was increasing and she was beyond 10% weight loss. Whilst she went through some cluster feeding days when I could barely put her down she slept for long periods at night despite me trying to rouse her. I also dropped weight drastically and my pre- pregnancy clothes were baggy within a week (I normally have to eat carefully and exercise to control weight - I.e. Not naturally like this). My midwife commented that she could see the weight drop off even overnight and thought it might indicate a thyroid issue, which might also explain apparent low milk supply. At this point, and with a 3 year old to look after as well now dh had returned to work, we agreed to top up, offering a breastfeed every time first. This worked well for a week, she put on weight. Now she is getting increasingly fractious and pretty much refusing to breastfeed, wanting a bottle instead. I haven't properly breastfed her for over 12 hours and have no signs of engourgement, leakage etc. The same thing happened with my son and with a heavy heart I switched him to formula. I didn't have the same midwife then (I was caseloaded this time) so although I noticed the weight loss no one who might see it as a problem did. I'm really hacked off that bf is failing again as I so wanted to feed both of them myself. Does anyone know about weight loss / thyroid / milk supply? And before you ask I am not dieting - au contraire I have never eaten so much in my life!