I believe Monroe and Rosalee's wedding took place in the spring. We also know there was a Christmas episode in season 4 which was episode 7. That alone would cover six months if the wedding took place in the spring. Adalind didn't give birth until the season 5 premiere. Her belly grew considerably between Highway of Tears and The Grimm Identity.
Once again, Adalind didn't sleep with anyone else after giving birth to Diana. The only other candidate would be Renard but he vehemently stated this pregnancy wasn't his doing and we have no reason to believe otherwise. I don't see why Adalind would lie to herself about Nick being the only man she slept with especially since she didn't want him to be the father.
This reminds me of another debate brought up weeks ago. There was speculation of Juliette sleeping with Meisner when there was nothing to support it. The show isn't going to keep things like this a secret especially when it can add to the drama they like so much. It would be like them keeping Juliette having sex with Renard or Kenneth a secret to be revealed at a later time. They could've easily done so but those liaisons were shown to us as they happened.
Once again, Adalind didn't sleep with anyone else after giving birth to Diana. The only other candidate would be Renard but he vehemently stated this pregnancy wasn't his doing and we have no reason to believe otherwise. I don't see why Adalind would lie to herself about Nick being the only man she slept with especially since she didn't want him to be the father.
This reminds me of another debate brought up weeks ago. There was speculation of Juliette sleeping with Meisner when there was nothing to support it. The show isn't going to keep things like this a secret especially when it can add to the drama they like so much. It would be like them keeping Juliette having sex with Renard or Kenneth a secret to be revealed at a later time. They could've easily done so but those liaisons were shown to us as they happened.