Step One: Pray over the child. Sprinkle baby with holy water, get them a sterling silver blessed bracelet with inscribed runes/blessings/prayers.
Step Two: Observe for isekai type reactions like “that stupid deity put me into this body” or “I will reclaim my title as archmage”
Step Three: Offer baby means to communicate, such as typing on an ipad.
Step Four: React to any messages with acceptance. Do not question the baby.
Step Five: Buy as many self help books as possible to deal with possible trauma from the past life.
Step Six: Raise in loving family with plenty of storybooks, movie nights, and family game times as possible, all while doing survival training. Me and S.O. will learn sword fighting, fencing, archery, shooting, etc. No way am I going to be the helpless mother kidnapped to threaten the super powered baby.
Generous of you to assume that I would have a partner...
"Hm...Not fucking intoxicated enough for this convo...First, house rule, do not fucking go and act on your own. Dunno whatever world, or life you life before, but this world ain't built for kiddos like you to explore willy-nilly. Got that? Second, you will not be skipping class, not one bit. I don't care if you know everything the system has to offer, I am not doing all that paperwork, and being scrutinized by the news station. Lastly, if you got anything fucking magical or outta this world, let me know, no hiding behind my back. You will not burn down my house to practice one of those fancy pyromancy craps. Crystal??"