We must know that the fertilization occurs about two weeks after the first day of the last menstrual period , when the sperm penetrates the egg , and within 24 hours after the fertilization , the egg begins dividing rapidly into many cells  . You should know that the fertilized egg remains in the fallopian tube for about three days ,  the fertilized egg (called a blastocyte) continues to divide , and it passes through the fallopian tube to the uterus to be implanted in its lining ( a process called the implantation ) .
It is very important to know that the developing baby is called an embryo from the moment of conception to the eighth week of pregnancy , and after the eighth week and until the moment of birth , the  developing baby is called a fetus .
It is very important to know that the first stage starts from the moment of zygote formation till the end of the sixth week . You should know that in this stage the head starts to differentiate ( it is similar to the reptiles head )  , The eyes appear distinctly , In the sixth week , the heart can be seen and heard pulsating using the sonar . It is very important to know that the second stage starts from the beginning of the seventh week till the end of the twelfth week . You should know that in this stage , the facial features can be distinguished , the genital organs start to develop , and the appearance of the digits in the limbs . It is very important to know that the third stage starts from the beginning of the 13th week till the end of the 22th week . You should know that in this stage , the bones start to develop , as well as the circulatory system , the sex of the embryo can be distinguished , and the mother can feel the movement of her fetus due to the strength of the embryo muscles which help in the movement .
It is very important to know that the fourth stage starts from the beginning of the 23th week till the delivery ( the birth ) .
You should know that in this stage , the development of all body systems is completed , the embryo can move his hands and feet . It is very important to know that before the delivery , the embryo position changes gradually to be inverted , where the head is directed towards the cervix . You should know that the baby can be born in the 28th week , where his two lungs are able to respire and all systems are completely developed .

So far, we've discussed in some length about a four year old's physical development here and social & emotional here. When it comes to the intellectual and cognitive development of children, parents generally show great concern - after all, we all want our children to grow up smart and successful. Below, we list some common developments you might see for your four year old child, and at the end, we'll share with you some simple tips and ideas that will help you enhance your child's cognitive and intellectual growth.
A four year old's speech is very intelligible as they are able to construct simple sentences and clearly express their thoughts and ideas. Their speech now involves clearly structured sentences, and is able to form longer sentences consisting of 5 or more words. Although a 4 year old can speak clearly, they will still have some difficulties with saying longer words, and different children may still have various distortions of certain sounds. A four year old begins to use past tense, prepositions, and possessives correctly in their speech. The child can answer most questions logically and is able to reason through with some simple problems.
The child can follow more complicated instructions and follow several steps of instructions one at a time. A four year old may be able to recognize and name many of the letters of the alphabet, and may be able to write several letters.
What if I told you that you could significantly enhance your four year old's cognitive and intellectual development by teaching them to read at this age? For a young child, reading is absolutely one of the best ways to stimulate cognitive development and enhance future academic success. Reading makes your child SMARTER, and the very act of reading can help children compensate for modest levels of cognitive ability!

There are also numerous other studies that find a direct link between a child's vocabulary and reading ability at a young age and their success later on in elementary and high school. Watch a 2 year old toddler read, and see how this child's reading skill develops at 3 and 4 years old. In this article, we'll list some interesting aspects of a four year old child's language, speech, cognitive, and intellectual development milestones that you might notice.
And indeed, the bulk of a young child's brain synapse formation takes place in the first 5 years of life! What this graph shows, is that from birth to about 5 years of age (the shaded darker blue box) is where the most synapse formation takes place within the brain. Often times, after having one question answered, the child continues with another questions, and another, and then another. At that time, based on several different reading level tests, she was reading at a grade 3 - 4 level. Click here to learn about a super simple and extremely effective program that will teach your child to read in just 12 weeks. Learning to read early helps your child build a strong foundation in reading, achieve an advanced vocabulary, become more articulate and fluent in their speech, and as research indicates, reading will make your child smarter. Some may find that hard to believe, but you can learn more about the program we developed to teach her to read here.

Easy ways to make money in 2 days collection
Money tree ideas for a wedding hamper
Guide to making money from home 3d