Objection overruled. The OP is not going during the more crowded holiday week with extended hours.
They could overlap Pres week by a day or two, since it is the week before. and there's always PM emh if they are onsite. PM EMH goes pretty late at MK and Epcot that week.
Since OP mentions a small child, I agree keeping him happy is key. You may want a stroller. To take advantage of evening hours a nap/break may be in order, even for some adults. There's also, in Feb, a chance someone will have a cold, which reduces endurance. If someone is not happy, do something different. That's a goldren rule of WDW. Sometimes, it's fun to hang out in a deluxe resort lobby watching folks go by, especially after a big meal. (GF, WL, AKL are all great!)
I'm not saying the nine am hour isn't useful, just not essential. Part of enduring a cool day well, can be starting it around 10:30am, because it's already warming up. So much depends upon the weather! Lots of times that week we've had really perfect warm weather too! Do pack layers, furry-type fleece coat with a hood.
As the day warms up, you shed clothes, then you have to carry. At night the opposite happens,
Last, I always get slammed saying this, but the die hard rope drop crowd can be a little over eager. Some can be so eager to be First!, they are plain rude. That's another reason I usually prefer to arrive just after they have left the gate. Some are cheery, some are rushing. Tough on your first visit, especially using buses, timing arrival for nine am is hard. that's another reason many don't make RD!
Conversely....the resort food courts experience a morning 'rush' hour about 8:15 to 8:30am, since mostly all the parks open at 9am. If you despise crowds, it may be good to arrive before the rush, or after, or send one person to get food while the rest get ready.
Where are you thinking of staying? Onsite or off? I've been assuming onsite in my posts.