Question. Is it normal to have two of your starting seven dwarves give birth without having a husband, like don't even have a husband on their relationship screen?
Might be a side-effect of removing the need for a child token for creatures to breed. Might be a bug. Check the kid's relations menu, and see if it lists the father or not.
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The reason the langurs are in your fort is because they are trying to steal stuff. But with the new fear mechanics they are failing miserably at it.
You could make a squad and toss some random dwarves into it to make them attack the langurs, but they may end up flailing about in fear as well. Once they get a higher discipline skill they will be better at military work though.
Press 'm' to enter the military screen. This screen allows you to select who goes in the military, what their gear is, and other things such as their scheduling. Don't enlist miners, hunters, or woodcutters, as they can get a bit confused as to which pieces of equipment to use, as their civilian jobs already have a uniform that they must wear.
Back on the standard view screen, press 's' to open the squad screen, then select the letter corresponding to the squad you want to choose, then press 'k' to give a kill order. Once you select the kill order, you can then mouse over what you want killed, and select them. Or you can choose from a list.
To get moss and fungus to grow, you first have to breach a cavern.