Well, I think I am taking a legal route and parenting route. I think it depends hugely on the childs current visitation and experience with father to spend a week away from mother. Granted, the courts may not consider it a 'hugely' issue...but would certainly look at that. I don't know the one of custody law in dc. I live in CA and I have to think we are comparable if not at the extreme of flat out indifference to the childs best interests in regards to custody.
Of a young one, there is a basic recognition in different states parenting plans with divorced couples...each state varies. If you don't already know, I would look up your states parenting plan for your childs age, etc.
also look on deltabravo.net for different visitation plans. You two do need to work out your holidays, etc. Frankly, I think your plan is a good one. Given our daughters temperment...I sometimes wish she didn't have the extreme changes in schedule that are common for school aged children for holidays...
I think your plan is good, and look up your states and future visitation plans for when she/he grows up and if going to court, will have to split christmas, easter, spring breaks, and alternate Thanksgivings...usually a 5 day stint.