Thank you for your inquiry. Blue Lace Agateand Rose Quartzare good for calming a baby that suffers from the energy blockages that cause colic*. To aid with digestive energy, Amberis good. If the baby is being held, the person holding him might consider wearing the crystals as forms of jewelry or carrying them in their pockets as tumbled stones. The crystals can also be placed under the mattress in a small bag so that they are kept safely away from the child, but their energy can reach the baby.
I hope that this information can be of assistance and that crystals grace your journey with love and light.
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*Disclaimer – Crystals are not a medical treatment and should not be used as a replacement for medical care. Please consult your healthcare specialist for your particular needs.