L.,
I have only one recommendation:
UV Natural <http://www.uvnatural.com/>
All the ingredients are naturally sourced and safe for prolonged use. They have an Adult and Baby formula (they are exactly the same) and a water resistant formula as well which is safe for both babies and adults alike.
I am a member of a group that is currently doing a group buy on this (wholesale pricing) and would be happy to send you the information.
There are many "Natural" products available today that might suit your needs, and I would suggest that you steer clear of anything too mainstream (Name brands) as they all contain artificial ingredients.
UV Natural is non-greasy, but the product does contain several oils so it does feel a little oily gong on, but they are readily absorbed by the skin for sun protection.
Some helpful links for choosing sunscreens that are safe:
<http://www.skinbiology.com/toxicsunscreens.html>
<http://www.mercola.com/2004/may/26/summer_sun.htm>
Scroll to "problem ingredients":
<http://www.aubrey-organics.com/about/articles/suncare.cfm>
Best of luck finding something that works/looks right for your family.
Blessings,
Rolinda
Wife, Mother, Friend