Youth Squads almost empty

[ds_61_1]

I'm in my second season with Liverpool. I've got to a point where I have improved the squad and am looking to build up my youth squads. The issue is I hardly have any players in my U21's and U18's and can barely field a starting 11 especially in my U18's which only has 9 players in it. Is there a solution to building both squads up. Obviously I don't expect a team full of Wunderkids but I left the responsibilites to my staff and they've almost decimated them to the point they can't field a full team.  Is there someway I can counter this? I don't want to have to micromange all three teams but I also don't want empty youth squads.