Is my daughter really overweight?

My daughter is approximately 16 months old. At her last medical check-up last week, her pediatrician told us that she's about 4 lbs overweight; she's currently 32" and weighs 32 lbs. Our daughter was born fairly tall, and weighed nearly 10 lbs. She's currently in the 97th percentile for height. Now, she's telling us to watch what we feed her. We never give her sweets - last time was a small piece of cake on her birthday. We definitely stay away from fast foods and primarily stick with homemade foods. She gets adequate servings of fruits and veggies, stays away from juices, drinks plenty of water, and is fairly active. Is this something we should worry about? The pediatrician might place our daughter on some sort of diet, but the pediatrician doesn't seem to understand that genetics plays a role here - my wife and I are tall, thick-boned people! Should I seek a second opinion?