by 
Worzel
ANSWERS: 2
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Great question, I looked it up :-p Newborns do have kneecaps. Kneecaps form about the fourth month of fetal life. However, they don’t show up on x-ray very well because they’re not ossified, or bony. At this point in life, the kneecaps are made of a cartilaginous material. The growth centers surrounding the kneecap form late in developmental life in utero and may not appear until just before or just after the infant is born. Source : http://www.madsci.org/posts/archives/1997-05/861940964.An.r.html
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Yes, they form in about the fourth month of fetal development - they just aren't easy to see on an X-ray as they are not yet ossified.
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