We often give this to dogs to mak them vomit if they eat a toxic substance so this will not poison your baby. However, she may get vomiting and/or diarrhea. Give her bread and milk to soak up and deactivate the peroxide. Do not worry if she vomits.it all up. Then let her rest for two hours and give her plain pedilayte and boiled chicken or cottage cheese.
Please let me know how she is.I wil be here til midnight and happy to help further.