Not being an "expert",I never have figured out a "babyback",except the meat dept has a CODE to help market loinbacks?
The "danish pork ribs",riblets,rib tips can all be falsely marketed at the market,or in retail restaurants as"babybacks".
Canadian Babybacks-because the loin is removed to make Canadian bacon.Button ribs (a.k.a. Applebee's riblets). These are technically not ribs. They are a thin, flat strip of meat and round bone, perhaps 1/4" thick, about 6" long, and 1 1/2" wide, cut from the sides of hog's spine behind the rearmost (14th) rib. There are no ribs on the hog there, just little nubs, or "buttons" attached to the backbone. Applebee's restaurants calls this cut riblets, but they are not what had been called riblets in the past. Because Applebee's has made them so popular, they can occasionally be found in stores under the name riblets. See riblets
I have even seen chain groceries cut 5-6 lb slabs of spares across the length of the slab,and because the bones are shorter,label them "babyback" ribs of 2.5 to 3 lbs.
You ask the kid that hoses out the meat market this week,and he can't tell bonein country syle ribs from pork rib chops.
Like Smokin' constantly preaches,weight,weight,weight ! and look at what you buy.
Butchers may cut out a little loin away from the rib slabs and leave much of it attached to the loin ribs,because they sell pork loin for $3/lb,and "babybacks" for $7/lb.
Figure where the money is.
Does a "babyback" have all the meat on top of the bones-rather than under the bones?
The famous Memphis ham sandwich joint,Rendezvous,at one time bought all the under 20 oz slabs available in corners of the quad state area,because they were grilling them high over a charcoal fire and they called them babybacks.
Without going to custom cutters,many of us buy IBP loinbacks in the 3 pac[from Sam's-or wherever] and with not much trimming ,make good backyard ribs.
Like Smokin' always says, the six lb 3 pac will cook a lot different than the 11 lb 3 pack,so you must weigh them,and take good notes to develop your personal time frames for feeding the family.
Just a couple of thoughts.