Baby's eyesight is fully developed approximately by the age of 8 months, even before that there is no need to show such large fonts, but after 8 months baby sees as good as adults, and able to easily concentrate.
Here is a brief progress of eyesight development:
At first your baby can't focus farther than 8 to 15 inches away — just far enough to make out the face of the person holding him. He can detect light, shapes, and movement beyond that, but it's all pretty blurry. Appropriately enough, your face is the most fascinating thing to your baby at this age (followed by high-contrast patterns such as a checkerboard). That is why at this age the best "learning" ( as always, but at this age it is extremely important), is personal interaction with the baby, speaking to him/her upclose, along with infant stimulation cards, designed using black and white patterns ( babies can study them for a long time and usually are fascinated by them!) Like this:
https://user.brillkids.com/onlinestore/tls-infant-stimulation-cards.php1 month
At birth your baby didn't know how to use his eyes in tandem, so they may have wandered randomly or even crossed now and then. At 1 month or next, he is able to consistently focus both eyes and track a moving object. A rattle passed in front of his face will often transfix him as he explores this newfound ability. He may also enjoy playing eyes-to-eyes with you: With your face very close to his, move your head slowly from side to side, with your eyes and his eyes locked. There are a lot of fun stimulating and bonding activities like that!
2 months
Your baby could see color from birth, but he had difficulty distinguishing similar tones, such as red and orange. That's one reason he preferred black-and-white or high-contrast patterns, and that is the reason for infant stimulation cards. For the next few months, his brain's at work learning to distinguish colors. This is a good time to show baby different colors, helping him to discover and develop this ability. Baby probably will start showing preference for bright primary colors and more detailed and complicated designs. This is excellent time to start showing pictures, photos, books, and toys ( and tailing about them, describing them). For the next couple of months baby still perfecting his object-tracking skills. Play games encouraging that
4 months
Time when baby is beginning to develop depth perception. Until now, it was tough for baby to locate an object's position, size, and shape, then get a message from his brain to his hand to reach out and grasp it. At 4 months, he has both the motor development to handle the task and the maturity in his brain circuitry to coordinate all the moves needed to accomplish it. You can help him practice by offering him easy-to-grasp toys like rattles (otherwise he'll go for your easy-to-grasp hair, glasses, or earrings). Excellent time to practice these activities and make it a learning adventure! This is also when many parents starting on Little Reader and Little Math, as it usually when baby shows readiness for activities and learning like that.
5 months
Your baby is getting better at spotting very small items and tracking moving objects. He may even be able to recognize something after seeing only part of it. This is evidence of his budding understanding of object permanence (knowing that things exist even when he can't see them at the moment), which is why he loves to play peekaboo. Build on these discoveries, leave part of a toy sticking from under the blanket and let baby "find" it, do simple memory games, -- excellent for development! At this age baby can also distinguish between similar bold colors and will start working on more subtle differences in pastels. Make it a learning adventure, play simple memory games, put different color groups of colors together and look at them, etc!
8 months
Your baby's vision — previously about 20/40 at best — is almost adult in its clarity and depth perception at this point. Though his attention is more focused on objects that are close by, his vision is strong enough to recognize people and objects across the room. His eyes are probably close to their final color, though you may see subtle changes later. After that there is no much change in eyesight development.
So at 13 months, I would not worry about gigantic fonts. Which makes it easier for you! Normal fonts used in LR would work just fine, just remember making every lesson, fun, personal and brief! Read books together, play games. You and baby will have so much fun discovering!
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