(((((((( Here's a long answer showing all the sizes (adults, too), width, length, etc., and a handy future reference, so it depends also on the definition of baby, one's tension, yarn materia, etcl. 3-6 mo is listed a bit below) then you'd add length for a fold up brim...?
The metric measurements are included also. I have this info in a main link, too for baby clothing, feet, blankets, etc. Send me a private message if you'd like and I'll get them to you.
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Head Size Chart - knitted or '''crocheted hats''' should be made about 1- 1 1/2" smaller aound than the head circumference, as the hats should stretch and sizes are not an exact science! If you make it, someone will fit into it. =)
* Height given is measured BEFORE the brim is already folded up - from the base of the un-folded up brim to the center top of hat. They can be made taller if you want a larger brim to fold up. On newborn hats, fold up about 1" for a brim, on adult hats figure 2" or so for a brim, but this varies according to personal preference.
NICU nurses say that baby ribs hat are ideal hats to knit for preemies and newborns because they have so much stretch and will fit several sizes of babies.
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Preemies
1 -2 lbs 1kg
Baby's Head Circumference is 9" - 10" 23-25 cm (so hat circ. should be about 7.5" -8" 18-20 cm) Height of hat should be 3.5 - 4" 10cm
2 - 3 lbs 1.4 kg
Head Circumference 10" - 11 1/4" 25-28 cm hat circ = 8.5" - 10" 22-25 cm Hat height = 4" 10 cm
4 - 5 lbs 2 kg
Head Circumference 11 1/2" - 12 1/2" 28-33 cm hat circ = 9" - 11.5" 23-28 cm Hat height = 4 to 4.5" 10-11cm
5 1/2 - 6 lbs 2.7 kg
Head Circumference 12 1/2" - 13" 31-33 cm hat circ = 11" - 12" 28-33 cm Hat height = 5 to 5.5" 13-15 cm
Newborns
Head Circumference 13" - 14 " 33-36cm; hat circ = 11.5" - 13" Hat height = 5.5 to 6" 13-15 cm
***********Baby - 3 to 6 months
Head Circumference: 14" - 17 " 36-43 cm; Hat height= 6.5 - 7" 15-18 cm *********ADD more for a fold up brim. One Height = 6.5" + 1" = 7.5" height.
Baby - 6 to 12 months
Head Circumference: 16" - 19 " 41-48 cm ; Hat height = 7.5" 18 cm
Toddler - preschooler (12 months - 3 years)
Head Circumference: 18" to 20 " 46 -48 cm; Hat height = 8" 20 cm
Child (3 - 10 years)
Head Circumference: 19" - 20 1/2" 48-51 cm; Hat height =8.5" 22cm
Pre-teens and Teens Hat
Head Circumference: 20 1/2" - 22" 53 -56 cm; height 9-10" 25 cm
Adult Woman
Head Circumference: 21.5" - 22.5" Hat height = 11"
Adult Man
Head Circumference: 23" - 24" 58.4 cm - 61 cm; Hat height = 11"-11.5"
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quote=lindade]I can't believe I have this question. On circular #7 needles, knitting a baby stocking hat with fold up brim. How many inches do I knit for newborn-3 months before I start the crown decreases. Researching is showing rows but not inches. What would the total length be. What would the inches be for the hat without the roll up brim. I could do a lot of differant hats if I had 'inches'. My old brain has gone totally blank on this one....
Can anyone help on this one? I quit~turning off google~and I'm going to bed. :?[/quote]