Eagerness to learn is a trait we often wish more of our youth would have.
But, what if the question of where babies come from is their current subject of interest??
They may wonder why you are talking about the birds & the bees ...and how relevant that is.
"Ask your Dad."
"But, he asked me to ask you, Mom."
Avoidance, or quickly changing the subject.
"I have to answer the phone."
"I didn't hear the phone ring."
How many people say they are Christians, yet say they don't feel comfortable talking about it??
Our children would not view this the same as the birds & the bees. It would appear that perhaps we don't have as strong of a commitment as we claim to have ...or that our beliefs contain some of our own doubt.
Or if we freely share our faith on a regular basis, but just mention words like faith, or being born again ...well, I'd hope that the other person doesn't just aim to shorten an awkward conversation by agreeing with something they feel uncomfortable not agreeing with.
We shouldn't agree just to avoid disagreement. And if we are the person looking for agreement, we should be satisfied with just words of affirmation. Yet, we also shouldn't make someone feel we are unsatisfied with them either.
And if someone says they are a Christian, we shouldn't bombard them, though neither should we feel that is the end game.
Christians should naturally want to share ...but, without overwhelming the other person's status (like posting 500 photos of your summer vacation, when your closest friend had lost his job and could never dream of doing all you've done). I'm sure God would think well of you if you thanked Him in your private prayer, for the new house, new car, or lavish vacation you just had. Yes, if you feel blessed ...abundantly thank God, yet we can mention to others how we are thankful for other things (such as things that they also have).
You can do what you want ...and I'm not telling you what you should do, it's just me expressing a perspective.
The apostles who walked with Jesus ...may have appeared to have little at all, yet the satisfaction of their hearts gave them what many others desired. They were eager to tell them.
And the others were eager to listen.