What is normal head circumference for a 4 month old?

Poor growth – Head circumference-for-age boys

Age	Weight (kg)	Head Circumference (cm)
Birth	3.3	34.6
1 month	4.4	37.1
3 months	6.1	40.5
5 months	6.45	42.5

What is normal fetal head circumference?

For a healthy full-term infant, normal head circumference is approximately 33–37 cms at birth. Males tend to have an HC that is 0.5 cms larger than for females (Amiel-Tison et al.

How big is a 6 month old baby head?

His or her head will grow ¼ inch per month between 6 months and 1 year of age. His or her head should measure close to 17 inches around by the time he or she is 6 months old and 20 inches by 1 year of age.

What is the normal HC at 20 weeks?

Calculating estimated fetal weight (EFW)

Gestational Age (Weeks)	BPD	Head Circumference
19 weeks	46	162
20 weeks	49	175
21 weeks	52	187
22 weeks	55	198

What is the normal BPD at 20 weeks?

Track your pregnancy

Weeks	BPD (mm)	AC (mm)
18.5	41.3	130.7
19	43.0	136.9
19.5	44.7	143.0
20	46.4	149.1

How strong is a 6 month old skull?

Now researchers have determined just how much weaker an infant’s skull is than an adult one, a finding that could have ramifications for a range of child-safety devices. Scientists from the University of Pennsylvania have determined that the young skull is only an eighth as strong as an adult one.

How big is a baby’s head at 21 weeks?

Head Circumference Calculator

x	5th%tile	Average
20	162	175
21	173	187
22	184	198
23	195	210

What is the normal HC at 21 weeks?

Track your pregnancy

Weeks	BPD (mm)	HC (mm)
20	46.4	176.8
20.5	48.1	183.0
21	49.7	189.2
21.5	51.4	195.3