Lets start at the beginning......
In some ways recumbents are just like ordinary bikes, in others rthey are completely different
One of the big differences id that child seats do not function well.
As the rider is low and the "normal" luggage is directly behind the rider the installation of a child seat makes the seat very high. This can drastically alter stability and handling. Some people do not mind, others feel that it is too much
The next is a trailer. Most recumbents will happily pull a trailer that is mounted to the rear axle. Rear frame mounted trailers can be a problem as it depends on the shape ofthe rear frame triangle. These can be narrower than an upright frame and it can be difficult to fit
Trailer bikes are another issue still and do not do well with recumbents
Many are seatpost mounted and of course there is no seatpost!
This limits you to Rack mounted ones, and this in turn is limited by the ability to fit the custom rack to your recumbent
Of course the ultimate is to buy yourself the much respected Kettwiesel trike and then a
"Trets" for the child
The Trets can can be used as a child trailer and then as a trailer bike before ultimately becoming an independent trike for the child.