What are the requirements and considerations for a Non O child visa for a baby with expatriate parents in Thailand?

Hi. Need some advice please for a Non O child visa. Sorry this is long..

I have elite visa (Canadian)

My husband has a valid WP but an expired Non B. (Spanish)

We just had a baby (Canadian passport now but possibly dual Spanish by the time we enter…).

We are in Canada planning on returning to Thailand.

Ideally we will renew my husband’s Non B and put the baby on a Non O dependent visa following his.

Scenario is… my husband has to leave Thailand maybe 2 months after we arrive. And the baby and I will potentially exit a month after his dad leaves. (Dad will eventually travel in and out much more frequently than us)

Questions are…

1. can the baby stay in Thailand on a Non O dependent visa (or extension of) even if his dad is out of the country?

2. Will I have problems exiting/entering Thailand with the baby when I have Elite and he has a Non O visa attached to his dad’s Non B visa who may not be traveling with us. (birth certificate has both parents names and baby carries both of our last names)

3. Should we do his visa on the passport matching his fathers country or mine? Or does it not matter? I have to check if Spanish can make a Non B in Canada, or if Canadian can make Non O in Spain 🤯 (I will always be traveling with the baby)

4. If the Non O causes problems for travel if his dad is in and out of the country. What is a better solution? Tourist visa? I don’t want problems trying to extend him during Covid when we both have long term visas (I realize there are no penalties for kids, but I’d like to keep his passport clean)

Thank you for your help. All of the paperwork/documents/entry requirements/different visas and nationalities are a bit overwhelming and I’m a bit confused about how to go about setting things up for the baby.

Any advice from multi National parents on different visas is greatly appreciated.

Thanks!