Once you've found your desired category or search results page, navigate through the thumbnails by using the arrows at the top right or bottom right of the section (bracketing the word "Next"). You can preview a larger version of these thumbnails by clicking on their respective magnifying glass. If you find an image or media you like, check its corresponding check box to select it. You can select as many as you like.
And of course, what's a scrapbook without clipart and graphics? You can find hundreds of sites that offer you free clipart and graphics to use in your scrapbook pages. There's no need to pay a fortune for fancy little stickers anymore when you can download all kinds of free images.
Whatever baby clip art you decide to use, be sure to keep a common theme throughout all of your projects. For instance, having matching thank you notes is a nice compliment to your invitations. Also, having personalized stationery for the mother to write her own personal thank you notes would be a wonderful idea.