It is true that postpartum depression affect mothers due to some certain hormones. Then is good you speak up your mind when it happened and you were able to give guidelines on how to deal it.

Is good yours wasn't severe, actually mind set usually contribute to it as well. When you are prepared on what is coming and you embrace it with joy, such hormones that causes depression will relax.

So next time always get yourself prepared for additional responsibilities and experience then you won't feel it much. Also, advice others that too then they will be fine.