You have my curiosity. I did a search and came up with a site like the ones that judge anointed men of God (reminds me of it at least) and make a big things out of a small things (misunderstanding the context of what is presented). They thought that one paternal character in a book I've never heard of was "weak". If that's all you've got!
I even looked to see what religion he might have been, and one site said: "Unitarian Universalist". This means everyone is going to Heaven (eventually). One site said he had a disdain for organized religion, of which if all he saw was some churches I know of, I would too!
God has said that some people will never enter the doors of churches because of how they were hurt in them by people who didn't know them. So that's not too alarming.
I went through a staunch fundamentalist period (for lack of a better term) where I despised Santa Claus for being an antichrist(!). In a way for some people he is, since (antichrist basically means instead of Christ). I believe God looks at St. Nicholas a different way. I don't condone the lying to children and the all-seeing eye of the Claus. If you lose Jesus during Christmas, you've lost it all. The whole world chuckles at Santa Claus so you can use it as a witnessing tool for the real meaning of Christmas (not at all commercial). Most people inwardly hate the commercialism. I now have a Christmas tree (rejecting any pagan roots). We acknowledge days of the week and months of the year without any nodding to the foreign gods that many of them are named after. God told Peter Tan that is was about worship, not culture (Eastern symbols being on certain currency) he was concerned about. Where is your heart?
It is possible to have a cursed object that needs to be destroyed and I've destroyed a number myself. (God dealt with me over time.) The Book of Mormon has a huge curse on it. Some people keep them as teaching tools. Beware!
It is possible to have a weak conscience too. We're not even supposed to ask about our meals (as in Paul's travels some offered their food to foreign idols) for conscience's sake. Some couldn't eat meat without their conscience giving them problems. Some messianic Jews still won't eat pork. If your conscience won't allow it, obey your conscience because otherwise you'll be in compromising sin. You can ask God who is greater than your conscience to give you His mind on the Seuss book. Some objects also have properties in the spirit realm based on where (or who) they came from. No point in getting paranoid about that. You can plead the blood of Jesus on everything you have and break any curses off of everything you own and speak a blessing over it. If something needs to be removed, and you are intent on pleasing God, even radically, He'll bring you back to it. Keep praising Him for the guidance. (Bind the devil because he's often the cause of many weak consciences.)
You could always tell your relatives that you want your little one to be consumed in a God consciousness and want to keep his mind stayed on the Lord in every way you can. You can "trade in" your books (for practically nothing) and replace them with better choices. Ask God to work it out with your family in a way only He can orchestrate.
Practically any day care will probably have access to these types of materials because children love them. You'll want to be free of any undue burdens or you won't have any peace. I kind of wished that I hadn't gotten into the superhero comic books. I think that I was "bewitched" by them and many strange powers were worked by some characters (usually the arch villains) in them. I've thought about this a lot over the years. They were easily my favorite possessions. I would go find the old originals and look at the covers and thought, "I was completely bewitched!".
I have found that sometimes when I physically talk (in a renewed state) with someone about certain things pleasing or displeasing God (with a godly person of the Spirit) that the anointing would get stronger as you were "steered" in a certain direction.
Angels take notes of our words and they are recorded. Not just because what we say speaks of the goodness of God, but rather that the goodness of God is continual! He delights in giving wisdom in our conversations and fulfilling His Word by giving light to the righteous. "Light is sown to the righteous."
Seeking to please the Lord and looking for the more narrow way (of grace), the Lord seems to guide the conversation a certain way and the increase in the peace or joy of the Lord is a sure sign of a more narrow way. You can even "see" disturbances in the spirit when certain things (potentially) manifest in the conversation as the light shines over the topic. Religious mindsets or deceptions start to be evident or even stir up and you can sense a little muddying of the waters or uneasiness. Praise the Lord! He won't allow His people to get into deception when they cleave to and trust Him and walk in His Word!
The sweetness of godly counsel as two people who acknowledge the Lord and His righteousness look for a more narrow way seems to draw out wisdom that is beyond ourselves. I look forward to it. I think that we know this somewhat on the forum, but when your mouth speaks it's like your "boat" is moving a certain direction and your "rudder" or tongue is facing one way. You meet resistance when you move aside from the more perfect paths of peace. It could be your words (and understand) that are amiss or imperfect, but sometimes it reveals a wall in the spirit that the one you're speaking to is suffering from. There's a "hit" against a demonic spirit (like the game Battleship!). Sometimes in repeating what you knew was truth, but sensing the "wall" causes the hammer of the Word to penetrate the listening seeker's "assignment" (depending on their willingness to seek actual truth). They could get a strong sense their take is amiss and a discomfort (I hate that!) It's because the enemy inhabits areas of our lives that are not fully sanctified.
In the search for truth, I think you have to both be willing to be wrong, not trusting in your own heart, but rather acknowledging the peace in the moving in the "waters of the Spirit" (and noticing any discord along the way). judging the peace as the correct way and the discord as deception or less perfect way.