(1) For your specified approach, search for IP baby monitor cams or nanny cams. You can choose the features you like, and internet connection lets you watch on ANYTHING that can connect to the web.
I have never used anything like what you are asking about, but here is ONE vendor offering a wide variety of harware that I found with a one minute search: http://www.networkcamerastore.com/products/baby-cam/
(2) There are many other sources, including sources for some other baby monitoring technologies that may serve your needs. You don't show where you live, but, if in the USA, local department stores like Target, Best Buy, Walmart, etc. will have some baby monitor cam examples you can consider.
(3) If you are open to an alternative approach, consider Security Spy on your MacBook with the mix of cams as you need. You can even use additional Mac-compatible USB webcams like those discussed in http://www.mac-compatible-web-cam.com/