No, the baby will not have a heart beat until about week 5. Here is a website for more information on every week of your pregnancy as well:
* http://3dpregnancy.parentsconnect.com/calendar/5-weeks-pregnant.html
pulse rate is >90bpm Bp 94/45
check pulse in wrist or neck
Your baby is both 4 weeks old and 1 month old.
The doctor should be able to hear the babies heart beat with a Doppler after about 16 weeks. If you are more than 16 to 20 weeks pregnant and the doctor can not hear a heart beat then you need an ultrasound to make sure the baby is ok.
newborn
Yes, a baby is considered to be one month old when they reach 4 weeks of age.
You are supposed to wait 4 weeks.
In 4 weeks
tadpole
4 weeks
If you mean 4 weeks after conception the embryo is about 1/6 to 1/4 inch (4 to 6 millimeters) long.
Baby hamsters can be sold once they are at least 4 weeks old.