By Melih Aslan and Ayla Jean Yackley ISTANBUL (Reuters) - Five Afghans, including two children and a six-month old baby, drowned in the Aegean overnight trying to reach Greece as Turkey starts to implement an EU agreement to curb illegal migration. The stream of migrants risking perilous sea crossings has so far shown little sign of abating after Turkey reached the draft deal with the EU on Monday, under which it will try to stem the flow in return for funding and political rewards. Turkey's EU Minister Volkan Bozkir said the deal, under which Ankara agreed to take back all irregular migrants, does not apply to those who have already reached the Greek islands and that the number returned was ultimately expected to be in the thousands or tens of thousands.