I can't emphasise how important Vit D is for everyone especially a baby. 3 months ago I almost lost my son because he was vit D deficient. He was well within his weight, looked very healthy and was developing at a reasonable pace. Then he had a seizure one evening that lasted for 10mins and he stopped breathing and had to be resuscitated he had another later in hospital which lasted 15mins. Vit D is responsible for the absorption of calcium. Important for brain dev, muscle dev, heart fnc, bone dev, WALKING, being able to sleep well etc. My son was exclusively breastfeed up until 6mths and then once on solids ate well. I used the Pregnacare range from before conception and I ate very well. Its important to remember that vit D can not be obtained sufficiently from food it has to be from the sun or supplements. The UK has a large percentage of adults who are vit D deficient or borderline deficient. Women who are deficient may never know they are unless they do a test. If you are deficient you will be unable to pass on enough during pregnancy to your baby. I thought we were a healthy family with a very balanced diet but that made no difference what we needed was sunlight or vit D supplements. I urge parents please if you want to choose to not give your child any vit D please either move to a temperate country or have them tested of vit D and calcium. It could save their life! 1 in 3 babies are Vit D deficient and the problem seems to be getting worse here in the UK. This is the info coming from the DOH. Kids have developed Rickkets some babies have died because of this please please Don't take this lightly!