As on a first days and weeks for baby not needing toys, he cannot to see theirs, but to the 3-4 week of life you can

 Attach to his bed a mobile as air composition, and elements of which moving for a calculation air  current,or rattles and a base rule keeping for healthy eyes a baby, is a distance from a face till a play is not must to be as less on 40 cm.And first  rattles are not to be as all colours rainbow,and size for one element, which baby s eyes are ability to differ are not higher,than 5-5 cm. And this is must to destroy his perception and his emotional background, and not buy mobile with different colors, music, and light.

Binocularly is a vision appearance,where in image on both retinas eyes connecting in one size picture and transferring in brain as allowing defining a form for items, distance till theirs or between them .As in his absence on any reason in a baby displaying   pathologies as strabismus, amblyopia, myopia.

Binocular vision in a babies are right away after birth still absences as of non-formed eye apparatus, but on 6-8 weeks he fixing eyes  on item, and on 3-4 months this is needing staying as norm. And till year stage is active mastering close space, and on 2-3 months a baby see items are on two sizes as width and  high , but a sense of touch helping him to add theirs by size as adding deep,and baby getting a first performance  about items sizes.And on 4-5 months is catching effect showing, and direction moving is right defining,and amassment distance till ab item is hard, as he is not ability rate a size ,he trying catching with hands are sun glares or shadow mobility.

And when baby is sitting and crawling,thus let s him a free to move.Stereoscopic vision  is faster developing, if a baby will be without obstacles comprehends surrounding his space, and he learning distances to object,to which he is moving, and understanding,that from a bed edge he can to fall, and of course add methods for preventing this, as baby not injuring. And walks too importance as for fresh air breathing,and sun light  very useful for a forming and developing eyeballs and other structures for vision organs.And since his first year of life check,that he not must injuring an own eyes,as his nails are sharp, as in his growing not significant, thus mum needing checking for this against scratching,as for children are older  not give for plays are sharp, small items,they can to damage vision organs, and not rub eyes, and learn theirs too, not touch with mud hands, and children not must staying in dust, smoke rooms, as they are bad affecting on breath and on vision.