This video from RTV Noord regional TV in the Netherlands says about itself (translated by me from Dutch):
May 17, 2011
Rangers saw last week from the behaviour of the adult couple that probably an egg had hatched. To be sure they had to take to the air to see the nest from above and to take pictures. Forester Jan Willems is sure now: there is an eagle chick.
According to the rangers, the eaglet is about 17 days old and weighs about 2 kilogram. Adult sea eagles weigh 7-8 kilogram.