My 6 month old baby was diagnosed with infantile esotropia. She has slight refractive errors. What do you say about botox in the eyes to improve eyes?

Get 2nd opinions. There is much debate around manamgement but comes down best evidence. See the following link I can recommend pediatric opthalmologist which did amazing work on my kid, and helped with timing of surgical intevention after we tried everything else. Good for second opinion if you are in Cape Town region 021-9488884.
Other choices ? Botox injected into any of the 6 muscles that control the eye position can help balance the process. It selectively weakens a specific muscle in an effort to improve how the eye lines up. In experienced hands it is one way to treat the problem. My thought would be to try less invasive treatments first.