PCB sound memory for toys
So many ways to skin this cat. How many different samples does it need? How many seconds total of recording time? How large of a speaker are you planning to drive?

The tasks to be done include:


Program the sound samples into memory in the factory (or your garage)
Monitor the buttons to decide which sample to play
Retrieve sound samples from memory
Convert digital samples to an analog wave form
Amplify the analog wave form to a level strong enough to drive a speaker 
Lather, rinse, repeat


There are, of course, other considerations to worry about, such as turning off the amplifier when not actively playing sound to prolong battery life, etc.

There is a whole range of solutions that can perform these steps; from doing it all in discrete hardware and software, to doing it all in one chip. The biggest determining factors are going to be how much engineering time and money you want to invest up front and how capable your hardware/firmware designer is.

It's very possible that the solution you pick for proof-of-concept (quick, for more money per piece) is not the same solution that you will want to go to production with (slower, but cheaper per piece).

At the risk of turning this into a shopping question...


Maybe take a look at the ISD ChipCorder parts?
Maybe try a Google search for "MP3 sound module"?
For a proof of concept demo, maybe something like a prototype playback board?