Manutuke Herbs NZ Herbal Range has a Stimulate remedy which aid liver flush (if the cause of Sleepy baby is from medications used during labour). Because these are homeopathic remedies, they will not cause harm. This remedy is applied to the nipple before three feeds for the day and only necessary for four days.
It is great for the overstimulated baby to help calm them but also to aid liver flush.
If you baby is sleepy, always discuss this with your LMC/GP/Well child nurse.