Feeding cups (a.k.a. "invalid feeders") came in all shapes and sizes intended for children and adults.
From the collector's standpoint one of the most coveted shapes is the one with the applied cover extending over the majority of its top and with a rounded hole near the back (see photo at left). I personally also like these because the larger top allows more room for more transfer-print.
Feeding cups were also made in silver and pewter (see photo below).
Feeding cups came in varying degrees of detail regarding where the spout was placed (see photo at left where one example has a single hole and the other many), size of the spout (from extra large to extremely small - see two example photos below) and placement of the handle (left, right, behind and not at all).
Examples of elaborately shaped 18th Century cream colored feeding cups:
Examples of 18th Century Lowestoft feeding cups:
Examples of 18th Century Isleworth feeding cups:
The "Kirby" Feeding Cup -
I highlight the "Kirby" because of its distinctive two piece design. While never reading its instructions I was always amazed at all the measurements on them, whether or not one was supposed to carry the small piece inside the larger piece when transporting it and whether each part had its own unique purpose depending on its content (i.e., medicine vs food, etc.). I also always liked it because the smaller piece looked so much like a pap boat.
Also pictured below is a more ornate version in celebration of Queen Victoria which I once owned - missing the smaller part.
Examples of other shaped, patterned and sized feeding cups: