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　　Look at the description, it should not be color blind.

　　We can do a simple test: prepare red, green, blue, yellow, black and purple building blocks for the baby to see (two at a time), because color blindness is divided into achromatopsia and partial color blindness (red blindness, green blindness, blue-yellow blindness, etc.), and color weakness includes full color weakness and partial color weakness (red weakness, green weakness, blue-yellow weakness, etc.). When the baby is in a happy mood, ask him if the two toys are the same color after careful observation. If he can distinguish the building blocks with various combinations of colors, it means that the baby is not born with color blindness or weak color. Maybe it's because the baby is playful, inattentive, not careful to remember, or has a poor memory when teaching him.

　　However, if the baby can't distinguish most of the combination colors or thinks that individual combinations are the same, it is very likely that he will have congenital color blindness or weak color. It is recommended to find an ophthalmologist for special examination as soon as possible. Because color blindness is divided into congenital and acquired, acquired color blindness is generally caused by fundus diseases. Please seek medical attention in time when eye diseases occur, and color vision can generally return to normal.

　　Children can classify colors, but they can't accurately say what colors are. This is not color blindness, but lack of cognition. Children's brains lack the corresponding relationship between colors and pronunciation.

　　If a child knows anything, he needs to pronounce it in accordance with the scene, which can be what he is doing or something.

　　For example, "eating", you are doing this thing, and children can easily understand the meaning of eating; Another example is "table". If you point to the table and say "table", the child will naturally understand the meaning of the table. The color is the same. You have to do the same training for your child: take out the yellow object and tell the child that it is "yellow", so that the child can have an intuitive understanding of the color and the brain can distinguish and remember it.

　　If you are really color blind, you can't tell colors apart! I have a cousin who is color blind. I remember playing chess together when I was a child. Every time he didn't know which piece was his, we didn't know there was such a thing as color blindness when we were young. We had to urge him to tell him every time. It was very strange, and later we realized that it was color blindness! I can't even get a driver's license now.

　　Summary: Children can classify colors, which shows that there is no problem with their eyesight, and they are not color blind! What children lack is the experience of matching the colors seen by their eyes with the colors stored in their brains. There is no color information stored in the brain at all, so children naturally can't tell which color is which!

　　Hello, it's my pleasure to answer your question.

　　You said that a three-year-old boy can classify the same colors when playing with building blocks, which shows that the baby has the ability of color recognition and also knows how to classify. The reason why I can't tell the color is not because the baby is color blind, but because the baby is still young and doesn't know what color is, so naturally it is impossible to tell the color clearly.

　　Parents are the children's first teachers, and all the performances and reactions of children before entering the park are closely related to their parents. If we want to make our baby better, we, as parents, will have to work hard! When you teach your baby to know colors, you must not have too many colors. Just let your baby know the four basic colors of red, yellow, blue and green.

　　This is red, red baby. Mom can't find the red circle. Mom likes the red circle best. Can you help me find it on the elephant's nose?

　　Don't be "discouraged" because the baby is taken wrong, because the child will always surprise us with praise and encouragement! At this time, we need to consolidate it through various review methods. It happened that I was wearing red short sleeves that day, so I said to the baby: Baby, look at mom's short sleeves. They are red. Just look for the red ones on the elephant's nose, which are the same color as mom's clothes. Later, the baby touched the blue, looked at the green, looked at the color of my clothes, and finally decided to run to me with the red circle. She said excitedly, "Mom, I found the red circle, I am great! I said baby found it, great! Don't be too anxious to teach your baby to recognize colors. You can't tell red, orange, yellow, green, blue and purple in one day. If the baby remembers red today, ask the baby the color of the apple when he wants to eat it. If the baby can't tell, tell him it's a red apple. It is very sweet and delicious. By repeating and strengthening the baby's memory through small details like this in life, the baby can definitely distinguish common colors within half a month!

　　There are many toys with color awareness, and there are also many cartoon videos that teach children to know colors, which are easy to find on the Internet. However, you can also teach the baby the color from the small details of daily life. Green plants are often raised at home. When you see the rich bamboo, tell the baby that it is a green rich bamboo; If the baby wants to eat bananas, tell the baby that it is a yellow banana; When you see the blooming flowers in the community garden, tell the baby that they are red flowers. They are so beautiful. .........

　　After you tell him the color, ask the baby, such as banana, and ask him what color banana it is. Baby will be happy and confident to tell you that this is a yellow banana ... If you insist more, your child will increase a lot of vocabulary while learning colors. With your appreciation and affirmation, baby's confidence and communication skills will be greatly improved!

　　I hope it will help you. I wish you and your baby a happy day and always smile!

　　No, it can only be said that children have no concept of classification, and color blindness needs specific testing.