I get asked this question a lot and so here are some suggestions regarding clothing and what to bring to the photo shoot. First I will start with some general suggestions and then go into a little more detail specific to the type of shoot you are considering:
Simple and elegant is the advice when selecting jewellery for a portrait. The same applies for any other accessories that you wish to have included in your portrait.
There are lots of clothing options for a maternity portrait each can be used with different lighting and backdrop styles:
Since your bump will be exposed, it is important that, for a couple of hours before the shoot, you don't wear any tightly fitting clothes across it (we don't want any marks left by waist bands etc), likewise for any other areas that are likely to be exposed.
Little ones photograph best in simple clothing. White and pastels are classic choices.
Newborns and babies have gorgeous skin, and nothing shows off that natural, innocent soul like nakedness (or just a nappy). An added bonus for slightly older babies, is that eyes tend to stand out more when they are not overpowered by clothing.
A popular look for baby and children portraits is all white. This gives a clean and natural look to the images, and is a great way to create a classic portrait that captures the purity of childhood.
Don't be afraid to put your baby or child in bold colours or prints. Although not generally recommend for an adult (or newborns), vivid colours on young children will result in a playful, lively portrait, especially primary colours like red, blue, and green.
If your child wears his Superman cape everyday, maybe you should let him wear it in a few pictures. Why not? You want pictures that capture how hereally is, right? Besides, he may be much more willing to take other non-cape pictures afterwards. Props can be great addition, too, so consider bringing your child's favourite book, stuffed animal or toy.
Coordinate outfits. Everybody in the portrait should wear items that complement each other in style and colour. It is not necessary for all clothes to match, but they must make sense together. Choosing clothes with same or similar colours unifies the picture and keeps the focus on the people in the picture.