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12 Responses to “Why Are Breast Feed Babies & Formula So Diffrent On Weight?”

1. mystic_e on February 18th, 2010 at 1:01 am

   There is a wider range of acceptable weights for breastfed babies because breastmilk is a more dynamic food -it adapts to the baby and baby’s needs. Formula is the same for all babies so they tend to grow the same, however you can overfeed a formula fed baby and in fact some formula fed infants become morbidly obese.
   My son was breastfed and weighed 20lbs at 4 months, which is huge. My second was also very big. I’m not sure how big but at 4 weeks he was 10 1/2 lbs (up 40oz from his birth weight). Apparently I just make big babies.
   Also keep in mind the CDC growthchart is very out of date even for formula fed babies.
   If your baby were formula fed she would be around the 70th percentile according to the cdc:http://www.cdc.gov/nchs/about/major/nhan…
   For a breastfed baby she is around the 50th percentile.http://www.who.int/childgrowth/standards…
   Either way she is just fine.

2. momtimes on February 18th, 2010 at 6:03 am

   I’m breast feeding my newest baby and am not noticing any difference in weight gain compared to my first two formula fed babies – my first child was only about 10 pounds at 3 months, my second was closer to 15….their starting weight makes a huge difference where they should be at 3 months old (first was 6lbs 1oz, second was 9lbs 11oz at birth).
   More important than the actual weight is the trend – plot her growth on a chart that shows averages by gender and see if she is trending properly (ie: my 2 month old son (#4) weighed 8lbs 2oz at birth which was right around the 50th percentile – bang on average. Now he weighs 12lbs 14oz which is in the 75th percentile for boys at 2 months old, meaning he’s bigger than average….but since his length/height is in the 90th percentile he is not getting fat, he’s just growing into his height!)
   If she does not seem to be gaining weight (ie dropped from 75th percentile to 25th percentile since birth), then you should talk to her doctor to see if supplementing with formula should be considered.
   good luck!

3. Jenn T on February 18th, 2010 at 10:00 am

   breast fed babies are fed on demand and get the perfect amount of calories. Your body changes the composition of your milk to accomodate your babies needs. It has lots and lots of fat in newborn milk and changes as they grow. It even changes as their demand changes. It’s really amazing.
   Formula fed babies are fed a constant amount of the same stuff at constant intervals. Seems pretty unnatural to me. All babies will be different weights at 3 months old because they are all different genetically. I had a baby that was 11 pounds at birth!

4. Dreaming of Carmel-by-the-Sea on February 18th, 2010 at 4:01 pm

   According to the Centers for Disease Control Growth Charts, which is followed by most American pediatricians, the 50% percentile for Girls at 3 months of age is 12 pounds. The general range is 9 1/2-15 pounds.
   At 2 1/2 months of age, my baby weighed 14 pounds (90% percentile for weight) and was 25” long (90% percentile for height), but was born weighing 6 ½ pounds (10th percentile for weight) and was 19” long (25th percentile for height). At 1-year-old, my baby weighs 24 pounds (75th percentile for weight) and is 31” long (90th percentile). My baby was small and light as a newborn, cherubic and chubby as an infant, and at 1-year-old is tall and lean.
   I breastfed my baby for six months, then switched to a milk-based formula. During both six-month periods, growth was at a normal pace.
   ###

5. Pippin on February 18th, 2010 at 4:15 pm

   The actual differences, statistically, are fairly small. (They have slightly different growth patterns, but the ‘average’ weights at any age only differ by, at most, a pound or two.)
   More important is the difference between babies. There is a wide range of ‘normal’ weights for all babies, at any age, however they are fed.
   (I have two neices, born two days apart. One was BF, one FF. BOTH weighed over 20 pounds by 4 months. Both were bigger, at 6 months, than my daughter [breastfed] was at 18 months. Both are now adolescents, and are ‘normal’ size, though taller than average.)

6. Sweet Tooth on February 18th, 2010 at 6:24 pm

   I formula fed both my babies on demand and they were about the same weight as yours at 3mo. They generally did not exceed 32oz a day, I know you can’t really measure breastmilk output unless you only pump. But whatever you breastfeed is proabably neither to little nor too much. My kids have been and continue to be in the 90-95th percentile for both height and weight.

7. Monika on February 18th, 2010 at 10:04 pm

   My children were bottlefed (on demand) and were a good weight. I don’t remember exactly. Don’t worry about it so much. As long as your daugter is eating and growing, she’s fine!
   Jenn T- Bottlefeeding doesn’t mean babies aren’t fed on demand. My sister-in-law breastfeeds, and she won’t let her son eat unless it’s “time” to eat, even if he’s crying with hunger. THAT’S UNNATURAL.

8. Anonymous on February 19th, 2010 at 2:14 am

   i breast fed my son till he was 5 weeks and at the one month check up he was almost 8lbs,and then i started formula.and at his 2month appointment he was 10lbs 11oz so now at 3months hes prob about 12.but my friends baby was 2times my sons size when her son was 2 months…

9. Jaydensm on February 19th, 2010 at 5:43 am

   formula is thicker and heavier than breastmilk. so babies gain more weight and get filled up faster compared to breastmlik. i breastfeed my son he is 7 months old. at 3 months he weighed 16lbs (he weighed 8.15 at birth)

10. Anonymous on February 19th, 2010 at 8:51 am

    I exclusively breastfeed my baby and he weighed 11 lbs 12 oz when he was one week shy of 3 mos old. He was only 4 lbs 9 oz when he was born.

11. Anonymous on February 19th, 2010 at 8:57 am

    I breastfed my baby and she weighed about 8.5 at 3 months. She’s a year old now and 15.25 pounds

12. SS on February 19th, 2010 at 9:55 am

    my son is formula fed and he weighed 12.1 pounds at 2 months.
    your baby is perfectly healthy!

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