With clothing it's confusing! This is what I say anyway (American):
Onesie: https://lp.hm.com/hmprod?set=key[source],value[/model/2012/P01%2005769%2097211%2000%200000%200.jpg]&set=key[rotate],value[]&set=key[width],value[]&set=key[height],value[]&set=key[x],value[]&set=key[y],value[]&set=key[type],value[STILL_LIFE_FRONT]&call=url[file:/product/small]
Jammies: https://lp.hm.com/hmprod?set=key[source],value[/model/2012/P01%2000854%20D1812%2000%200000%200.jpg]&set=key[rotate],value[]&set=key[width],value[]&set=key[height],value[]&set=key[x],value[]&set=key[y],value[]&set=key[type],value[STILL_LIFE_FRONT]&call=url[file:/product/small]
Pacifier: https://t3.gstatic.com/images?q=tbn:ANd9GcT_cFo13Y_7D0CiPOqyVPtr9ZDXRBwD9B_WzWXKM9LGp70u5D9_PeveJJE
Diaper = nappy
Potty for the plastic training thingy, yes.
Bassinet for the small baby beds, usually fitting babies under 6 months only
Crib for the larger ones that often do as a toddler bed as well when one side is taken off