my friend had been diagnosed underactive thyroid after having her first child 9 months ago

[Biglips]

she is on tablets - thyroxine (sp?) BUT she had lost lot of weight (its what she had told me and yes she is very thin atm and thats the thinnest ive seen her in 23 yrs as she usually have a nice slim figure).

Docs is puzzled and i dont think its PND as she is still herself but she said that she was feeling so exhausted and her baby started to sleep thru when he was about 5-6 months old.

what cud it be?

i put it down being a first time mum