What is the pressure from exactly? She either hits the milestones "on time" or she doesn't. There's not much you can do about it at the time. My wife and I watch our daughter change and try to map changes to milestones, but we're just marveling and along for the ride.
The pressure is from discerning whether we as parents are doing all we can and providing the right resources, environment, etc for her to reach milestones. For example, behind on nonverbal communications? Have we been gesturing enough, demonstrating enough? Are we doing wrong when we leave her in the pack and play for a bit while getting work done? It seems impossible to know.
At the end of the day, you have to decide what a good life is and help the, achieve that. If you think a good life requires getting into the “right” school and the “right” job, etc., you may need to figure it out more before trying to get someone else’s life on track.