Skip Navigation

DVD Ilustrado Multilíngue

The Biology of Prenatal Development


3 - 4 Meses


THE BIOLOGY OF PRENATAL DEVELOPMENT

.English


 

Baixar Versão em PDF  O Que é PDF?
 

Capítulo 40   3 a 4 Meses (12 a 16 Semanas): Papilas Gustativas, Movimento de Mandíbula, Reflexo de Sucção, Percepção dos Primeiros Movimentos do Feto

Reproduzir Filme - Weight Gain
Reproduzir Filme |  Veja Instantâneos
Between 11 and 12 weeks, fetal weight increases nearly 60%.

Twelve weeks marks the end of the first third, or trimester, of pregnancy.

Reproduzir Filme - Taste Buds
Reproduzir Filme |  Veja Instantâneos
Distinct taste buds now cover the inside of the mouth.
Reproduzir Filme - 3 Months Pregnant
Reproduzir Filme
By birth, taste buds will remain only on the tongue and roof of the mouth.

Reproduzir Filme - Bowel Movements
Reproduzir Filme |  Veja Instantâneos
Bowel movements begin as early as 12 weeks and continue for about 6 weeks.

The material first expelled from the fetal and newborn colon is called meconium. It is composed of digestive enzymes, proteins, and dead cells shed by the digestive tract.

Reproduzir Filme - Upper and Lower Limbs
Reproduzir Filme |  Veja Instantâneos
By 12 weeks, upper limb length has nearly reached its final proportion to body size. The lower limbs take longer to attain their ultimate proportions.

Reproduzir Filme - Responds to Touch
Reproduzir Filme |  Veja Instantâneos
With the exception of the back and the top of the head, the body of the entire fetus now responds to light touch.

Reproduzir Filme - Gender Differences
Reproduzir Filme |  Veja Instantâneos
Sex-dependent developmental differences appear for the first time. For instance, female fetuses exhibit jaw movement more frequently than males.

Reproduzir Filme - The Rooting Reflex
Reproduzir Filme |  Veja Instantâneos
In contrast to the withdrawal response seen earlier, stimulation near the mouth now evokes a turning toward the stimulus and an opening of the mouth. This response is called the "rooting reflex" and it persists after birth, helping the newborn find his or her mother's nipple during breastfeeding.

Reproduzir Filme - Tooth Development Begins
Reproduzir Filme |  Veja Instantâneos
The face continues to mature as fat deposits begin to fill out the cheeks and tooth development begins.

Reproduzir Filme - Blood Cells and Bone Marrow
Reproduzir Filme |  Veja Instantâneos
By 15 weeks, blood-forming stem cells arrive and multiply in the bone marrow. Most blood cell formation will occur here.

Reproduzir Filme - Quickening
Reproduzir Filme |  Veja Instantâneos
Although movement begins in the 6-week embryo, a pregnant woman first senses fetal movement between 14 and 18 weeks. Traditionally, this event has been called quickening.
3 - 4 Meses