I use Advanced Nutrients - THC (Total Horticultural Concentrate) Grow A&B for vegitation & Bloom A&B for flowering.
Also I use B-52 (micro nutrients) threwout the whole grow.
For seedlings i use .05ml to each liter of water of THC Grow A&B. and .05ml of B-52.
For 3-5 week old plants in veg i use 1-1.5ml to each liter of water of THC Grow A&B. and .05-1.0ml of B-52.
Always allow vegging nutes to continue 1 week after flowering has been induced.
For Flowering plants in week 2 i use 1.0ml to each liter of water of THC Bloom A&B, and 1.0ml of B-52.
Week 3+ of flowering gets 2.0ml of THC Bloom A&B and 1.5ml of B-52.
At the last stage i flush with pure clean fresh water for the last 10 days of the flowering stage.
Good Luck, i hope this is an idea for you to consider, also to your question, do not give much nutes to the babies, just a lil bit and make sure its been diluted.
P.S Mine are seedlings too.
Peace,
Bliss.