It hasn't been an easy road! Kim and Kanye reported wanted baby #4 to come immediately after daughter Chicago, now 11 months old, was born -- but all did NOT go according to plan ...

Mr. and Mrs. West reportedly waiting until Kanye was in the "best state of mind" before hiring a NEW surrogate and using their second and supposedly last embryo -- a boy. Meaning ... Kanye was NOT in the best state of mind previously -- but then again, we all knew that.

The rapper has been open about his struggle with mental issues including depression and with the anti-depressants he's been prescribed. In fact, he recently broadcast to the world that he's med-free and feeling better than ever and apparently his wife feels he's in a good place because they're on the path to a May birth.

A source tells Us Weekly: "Kanye has been great. He’s been healthy, happy and his head is clear. They are both very excited for this new baby."

And on to the surrogate news -- the pair are using a new surrogate this time -- not the same gestational carrier they used for daughter Chicago. Their previous surrogate was La’Reina Haynes who appeared in an episode of Keeping Up With the Kardashians with her face obscured. She was great, however the birthing agency reportedly let some private details leak and the couple wasn't too happy about it so they are using a new agency and new woman to carry baby #4, according to Us.

The mag reports Kim "always wanted four kids" and that she's ecstatic about making their family six!