S.H.
I co-slept with both my kids, off and on, and still do occasionally.
Yes, you want to make sure they don't get hurt or suffocated by accident, because they are very mobile at this age. AND, sometimes the Parents sleep so soundly...that they don't always "know" or "hear" if their baby fell out, or is still there, or is not buried under the covers, or tangled up in them etc. Put it this way, once, my Father fell down in the middle of the night and couldn't get up....my MOM didn't even hear him fall, nor him making noise to call her. He was on the ground overnight this way... he had a stroke. She didn't know.
My point is, not all "Accidents" are "noisy"...and we sometimes CANNOT even know when we are sleeping. Accidents are often "silent."
What I did when my kids got to that "stage" is, we got a futon, put it on the floor in our room... and then, since it was ON the ground, we didn't have to worry if our kids "fell out." AND, we adamantly baby-proofed our bedroom...NOTHING was on the floor. We did not put any blankets anywhere either. But, I am also a light sleeper... and I wake at the smallest sounds. BUT, I would sleep with my kids on the futon, or my Husband would. Then, as they grew out of it, or depending on their needs or phases... I still co-slept with them or not.
*oh just wanted to add: as she DOES get more mobile, and gets to crawling, standing, and just has more motor skills...yeah, they can get "stuck" in crevices. But, also, where does she nap? In the bed? If so, and you are not right there...she could manage to crawl out, and fall out of the bed. Almost all babies fall off the bed at some point. And depending on how they fall... they may get hurt. The thing is, she WILL get to the point where she can manipulate her body and go places...and so, you'll need to think about how you will circumvent this, because the side-car apparatus will not keep her "in." Unless, you just transition her to the crib, and with the railings in and fully up. Or, you'll just have to co-sleep with her for naps too... and make sure she's safe.
For us, I co-slept on the futon with my kids. BUT, for naps, and the initial putting to bed, for my son at least, we always put him in his crib first. Then when and if he wakes during the night, I pick him up and co-sleep with him. But with my first child, she was more high-needs and I always had to co-sleep with her since infancy, and she would not transition to a crib and she was just very spirited anyway. So, evaluate "how" you will manage it when your baby gets very mobile and with increasing motor skills.
It's such a nice bonding thing to co-sleep. Everyone is different, and different in how long they do it.
just do what you feel is best & safest.
All the best,
Susan